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Binomial Theorem Formula

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Mastering the Binomial Theorem: Formulas, Proofs, and Applications

Comprehensive Definition, Description, Examples & Rules 

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Introduction to the Binomial Theorem

A Binomial is a two-term algebraic expression, and the binomial theorem is a binomial force that can’t be extended by using algebraic identities. This concept of the binomial theorem is relevant in practical life as well. On this page, you will find its meaning, practicality, formulas, etc. You will also find a worksheet at the end of this page that will help you improve your mathematical skills.

Binomial Theorem Definition

A large-power binomial expansion can be easily calculated with the binomial theorem. The binomial theorem is a process of expanding expressions to infinite power. It is a significant method for algebraic expressions. A binomial expression contains two terms, like x+y, x³+y³, and so on.

Historical Background

The binomial theorem has a significant background in mathematics. Binomial is not a new concept in mathematics. Isaac Newton gave this concept in 1665, and in 1670, James Gregory came up with the formula for the binomial expansion of fractional power.

The binomial theorem has roots dating back to the century BC, and in the 3rd century BC, the Indian mathematical name pingala was given to the concept of the Pascal triangle.

Importance in Mathematics

The binomial theorem has significance in mathematics.

  • You can solve the complex expansion equations by using the binomial theorem.
  • The binomial theorem is used in statistics for the management of large amounts of data.
  • The binomial theorem is used in calculus, and it is also useful in physics and the practical world.

The Binomial Formula

You must be aware that (x+y)²= x²+y²+2xy, but when the expansions are in larger numbers, then it would become easy to solve the equation.

The binomial expansion formula also contains the coefficient, which is

The binomial theorem formula is:

(x+y)n = nC0 xny0 + nC1 xn-1y1 + nC2 xn-2 y2 + … + nCn-1 x1yn-1 + nCn x0yn

You can also write this formula as: 

(x+y)n = ∑nk=0nCk xn-kyk = ∑nk=0nCk xkyn-k

where nCr = n! / [r! (n – r)!]

The formula of the binomial theorem for rational power is (1+x).

 Here, for the expansion of a binomial series, this formula is required, in which a and b are real integers and n is a positive integer.

There are distributive properties like multiplication over addition in binomial formulas.

Binomial Coefficients

Coefficients in binomials are positive integers that denote various ways of choosing a subset of an object from a larger set.

Binomial Expansion

Another name for binomial expansion is the binomial theorem. It reflects “a” as a power n and is a zero term. The power of ‘a’ decreases when the power of ‘b’ increases. It helps determine the high-power roots of an equation.

Proof of the Binomial Theorem Formula

There are various proofs of the binomial theorem that reflect its authenticity.

Inductive Proof

Inductive proof is a method of using induction for all positive integers through the binomial theorem. It includes various steps: the first one is the base case that reflects n = 1, the second one is the assumption that the theorem has a positive integer k, and the third one reflects the final step, which is n=k+1.

Combinatorial Proof

Combination proof is a process of theorem that counts the data in two other ways. You can find the two counts different by using this process with combinatorial principles.

Taylor Series Proof

It includes the expansion of the Taylor series. The Taylor series is useful in the expansion of series and the identification of coefficients.

Visual Geometric Proof

It reflects the geometric use of binomial theorems. You can get an expansion form of binomial through visual geometric proof that includes visual representation as well.

Applications of the Binomial Theorem Formula

Algebraic Applications

  • In algebraic applications, it is used for factorization.
  • It makes the complex equation easier.
  • You can solve the infinite powers equation by using the binomial theorem.

Probability and statistics

  • In probability, it is useful for probability distribution. You can solve difficult probability questions by using this theorem.
  • You can use binomial theorems in hypotheses.

Combinatorial Applications

  • Combinatorial applications are useful in solving arrangement-related equations.
  • The Pascal triangle of combinatorial applications is useful in solving equations related to combinatorial applications.

Calculus and Taylor Series

  • This concept is useful in science. Calculus series are helpful in computer science.
  • The calculus series is helpful in developing analytical skills.

Binomial Theorem Examples

Concrete Examples and Step-by-Step Solutions

  •  (x+y)2 and (x+y)3

(x+y)2 =  2C0 x2y0 + 2C1 x2-1y1 + 2C2 x2-2 y2

⇒ (x+y)2 = x2 + 2xy + y2

And (x+y)3 = 3C0 x3y0 + 3C1 x3-1y1 + 3C2 x3-2 y2 + 3C3 x3-3 y3

⇒ (x+y)3 = x3 + 3x2y + 3xy2 + y3

⇒ (x+y)3 = x3 + 3xy(x+y) + y3

  • (x+3)5 =
  •  5C0 x530 + 5C1 x5-131 + 5C2 x5-2 32 + 5C3 x5-3 33 + 5C4 x5-4 34 + 5C5 x5-5 35

= x5 + 5 x4. 3 + 10 x3 . 9 + 10 x2 . 27 + 5x .81 + 35

= x5 + 15 x4 + 90×3 + 270 x2 + 405 x + 243

Application of the Theorem in Real-Life Scenarios

  • It is useful in real-life scenarios; there is a diverse range of uses of the binomial theorem in physics.
  • In computer science, the binomial theorem is useful in the distribution of data.

The n term formula

Introduction to the n Term Formula of a Binomial Expansion

This is the general term for binomial expansion. In the n term formula,  the sum of terms with exponents is equal to n. Where n is the natural number and r is expansion. A, B, and C are the variables. You can easily calculate this using this formula.

 (x + y)n is Tr+1 = nCr xn-ryr      

How to Find a Specific Term in a Binomial Expansion

You can use a common formula for finding out the specific term in a binomial expansion.

You can find the specific term in binomial expansion by using a formula like

(x+y)n = nC0 xny0 + nC1 xn-1y1 + nC2 xn-2 y2 + … + nCn-1 x1yn-1 + nCn x0yn

This is a specific formula that can help you find the terms.

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Key Takeaways

  1. The binomial theorem is a significant concept in maths. It is useful in physics and other sectors as well.

  2. The binomial theorem is not a new concept.

  3. There are various series and applications of the binomial theorem.

  4. If you want to improve your understanding of the binomial theorem, then you must practice the binomial theorem, which you can do through the worksheet given on this page.

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Frequently Asked Questions

It is proven through the base case, inductive steps, and assumptions.

(x+y)2 and (x+y)3

 

(x+y)22C0 x2y0 + 2C1 x2-1y1 + 2C2 x2-2 y2

⇒ (x+y)2 = x2 + 2xy + y2

And (x+y)3 = 3C0 x3y0 + 3C1 x3-1y1 + 3C2 x3-2 y2 + 3C3 x3-3 y3

⇒ (x+y)3 = x3 + 3x2y + 3xy2 + y3

⇒ (x+y)3 = x3 + 3xy(x+y) + y3

This theorem is practically applicable in physics and computer science.

You can find various additional resources for learning about the binomial theorem, and Edulyte also provides you with a worksheet that you can consider for improving your mathematical skills and developing your understanding of binomial theorems.

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2D Shapes2cosacosb Formula30-60-90 Formulas3D ShapesAbsolute Value FormulaAcute AngleAcute Angle triangleAdditionAlgebra FormulasAlgebra of MatricesAlgebraic EquationsAlgebraic ExpressionsAngle FormulaAnnulusAnova FormulaAnti-derivative FormulaAntiderivative FormulaApplication of DerivativesApplications of IntegrationArc Length FormulaArccot FormulaArctan FormulaArea Formula for QuadrilateralsArea FormulasArea Of A Sector Of A Circle FormulaArea Of An Octagon FormulaArea Of Isosceles TriangleArea Of ShapesArea Under the Curve FormulaArea of RectangleArea of Regular Polygon FormulaArea of TriangleArea of a Circle FormulaArea of a Pentagon FormulaArea of a Square FormulaArea of a Trapezoid FormulaArithmetic Mean FormulaArithmetic ProgressionsArithmetic Sequence Recursive FormulaArithmetic and Geometric ProgressionAscending OrderAssociative Property FormulaAsymptote FormulaAverage Deviation FormulaAverage Rate of Change FormulaAveragesAxioms Of ProbabilityAxis of Symmetry FormulaBasic Math FormulasBasics Of AlgebraBinary FormulaBinomial Probability FormulaBinomial Theorem FormulaBinomial distributionBodmas RuleBoolean AlgebraBusiness MathematicsCalculusCelsius FormulaCentral Angle of a Circle FormulaCentral Limit Theorem FormulaCentroid of a Trapezoid FormulaChain RuleChain Rule FormulaChange of Base FormulaChi Square FormulaCirclesCircumference FormulaCoefficient of Determination FormulaCoefficient of Variation FormulaCofactor FormulaComplete the square formulaComplex numbersCompound Interest FormulaConditional Probability FormulaConeConfidence Interval FormulaCongruence of TrianglesCorrelation Coefficient FormulaCos Double Angle FormulaCos Square theta FormulaCos Theta FormulaCosec Cot FormulaCosecant FormulaCosine FormulaCovariance FormulaCubeCurated Maths Resources for Teachers – EdulyteCylinderDecimalsDifferential calculusDiscover the world of MathsEllipseEquilateral triangleEuler’s formulaEven numbersExponentsFractionFraction to decimalGeometric sequenceHeptagonHyperbolaIntegersIntegrationIntegration by partsLinesLocusMatricesNatural numbersNumber lineOdd numbersParallelogramPercentage formulaPerimeterPolygonPolynomialsPrismProbabilityPyramidPythagoras theoremRoman NumeralsScalene triangleSetsShapes NamesSimple interest formulaSlope formulaSolid shapesSphereSquareStandard deviation formulaSubtractionSymmetryTimeTrianglesTrigonometry formulaTypes of anglesValue of PiVariance formulaVectorVolume formulasVolume of a coneVolume of sphere formulaWhole numbers
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