The (a -b)2formula is supplied to find the square the a binomial.This (a -b)2formula is among the algebraic identities. This formula is also known as the formula because that the square that the distinction of two terms. The(a -b)2formula is offered to factorize part special species of trinomials. In this formula, wefind the square that the difference of two terms and also thensolve it v the help of algebraic identity. Let united state learn an ext about(a -b)2formula together with solved examples in the following section.

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What Is(a-b)^2 Formula?

The (a -b)2formula is also widely known as the square of the difference in between the two terms. This formula is occasionally used to factorizethe binomial. To discover the formula of(a -b)2, us will just multiply (a -b)(a -b).

(a -b)2=(a -b)(a -b)

= a2-ab -ba + b2

= a2-2ab + b2

Therefore,(a -b)2formula is:

(a -b)2= a2-2ab + b2

Proof of(a − b)2Formula


Let united state consider(a - b)2as the area the a square with size (a - b). In the above figure, the biggestsquare is displayed with areaa2.

To prove that (a -b)2= a2-2ab + b2, consider reducing the length of all sides by element b, and also it i do not care a - b. In the figure above, (a - b)2is presented by the blue area.Now subtract the vertical and also horizontal strips that have actually the area a×b. Remove a × btwice will alsoremovethe overlapping square in ~ the bottom appropriate cornertwice hence add b2. Top top rearranging the data us have(a − b)2= a2− abdominal − ab + b2. Therefore this proves the algebraic identity(a − b)2= a2− 2ab + b2

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Examples on(a-b)^2 Formula

Let usconsider couple of illustrations based onthe (a-b)^2 formula in this solved instances section.

Example 1:Find the worth of (x -2y)2by using(a -b)2formula.


To find: The value of (x - 2y)2.Let us assume the a = x and b = 2y.We will certainly substitute these worths in (a -b)2formula:(a -b)2= a2-2ab + b2(x-2y)2= (x)2-2(x)(2y) + (2y)2= x2- 4xy + 4y2

Answer:(x -2y)2= x2- 4xy + 4y2.

Example 2:Factorize x2- 6xy + 9y2by using(a -b)2formula.


To factorize: x2- 6xy + 9y2.We can write the offered expression as:(x)2-2 (x) (3y) + (3y)2.Using(a -b)2formula:a2-2ab + b2=(a -b)2Substitute a = x and also b = 3y in this formula:(x)2-2 (x) (3y) + (3y)2. = (x - 3y)2

Answer:x2- 6xy + 9y2= (x - 3y)2.

Example 3:Simplify the complying with using (a-b)2 formula.

(7x - 4y)2


a = 7x and also b = 4yUsing formula (a - b)2 =a2 - 2ab + b2(7x)2 - 2(7x)(4y) + (4y)249x2 - 56xy + 16y2

Answer:(7x - 4y)2=49x2 - 56xy + 16y2.

FAQs ~ above (a -b)^2Formula

What Is the expansion of (a -b)2Formula?

(a -b)2formula is review as a minusb whole square. Its development is expressed as(a - b)2 =a2 - 2ab + b2

What Is the(a -b)2Formula in Algebra?

The (a -b)2formula is also known as one of the importantalgebraic identities. It is read as a minusb entirety square. That (a -b)2formula is to express as(a - b)2 =a2 - 2ab + b2

How To simplify Numbers Usingthe(a -b)2Formula?

Let us know the use of the (a -b)2formula v the assist of the complying with example.Example:Find the value of (20- 5)2using the (a -b)2formula.To find:(20- 5)2Let united state assume that a = 20 and b = 5.We will certainly substitute these in the formula of(a- b)2.(a - b)2 =a2 - 2ab + b2(20-5)2= 202- 2(20)(5) + 52=400-200 + 25=225Answer:(20-5)2= 225.

How To use the(a -b)2Formula offer Steps?

The adhering to steps are followed while using(a -b)2formula.

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Firstlyobserve the pattern of the numbers whether thenumbers have whole ^2 as power or not.Write under the formula of(a -b)2(a - b)2 =a2 - 2ab + b2substitute the values ofa and b in the(a -b)2formula and simplify.