# Solve ab/2

The **(a -b)2formula** is used lớn find the square of a binomial.This a minus b Whole Square Formula is one of the commonly used algebraic identities. This formula is also known as the formula for the square of the difference between two terms. The(a -b)2formula is used lớn factorize some special types of trinomials. In this formula, wefind the square of the difference between two terms and thensolve it with the help of algebraic identity. Let us learn more abouta minus b Whole Squarealong with solved examples in the following section.

Bạn đang xem: Solve ab/2

## What Is(a-b)^2 Formula?

The (a -b)2formula is also widely known as the square of the difference between the two terms. This formula is sometimes used to factorizethe binomial. Lớn find the formula of(a -b)2, we 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 ofA minus B Whole Square Formula

Let us consider(a - b)2as the area of a square with length (a - b). In the above figure, the biggestsquare is shown with areaa2.

To prove that (a -b)2= a2-2ab + b2, consider reducing the length of all sides by factor b, và it becomes a - b. In the figure above, (a - b)2is shown by the xanh area.Now subtract the vertical và horizontal strips that have the area a×b. Removing a × btwice will alsoremovethe overlapping square at the bottom right cornertwice hence add b2. On rearranging the data we have(a − b)2= a2− ab − ab + b2. Hence this proves the algebraic identity(a − b)2= a2− 2ab + b2

Want khổng lồ find complex math solutions within seconds?

Use our không lấy phí online calculator khổng lồ solve challenging questions. With 1art.vn, find solutions in simple & easy steps.

Book a không tính phí Trial Class

## Examples on(a**-**b)^2 Formula

Let usconsider a few illustrations based onthe (a**-**b)^2 formula in this solved examples section.

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

**Solution:**

To find: The value of (x - 2y)2.Let us assume that a = x & b = 2y.We will substitute these values 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 aminus bWhole Square Formula.

Xem thêm: Top 5 Máy Tính Bảng Giá Rẻ Dưới 5 Triệu Tốt Nhất 2021, Máy Tính Bảng Từ 2 Triệu Đến 5 Triệu Chính Hãng

**Solution:**

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

(7x - 4y)2

**Solution:**

a = 7x và 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 on A minus B Whole Square Formula

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

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

### How khổng lồ Simplify Numbers UsingtheA minus B Whole Square Formula?

Let us understand the use of the (a -b)2formula with the help of the following example.**Example:**Find the value of (20- 5)2using the (a -b)2formula.To find:(20- 5)2Let us assume that a = 20 & b = 5.We will 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= 225**Answer:**(20-5)2= 225.

### How lớn Use the(a -b)2Formula Give Steps?

The following steps are followed while using the (a -b)2formula.

Xem thêm: Viết Phương Trình Đường Thẳng Trong Mặt Phẳng Oxy, Phương Trình Đường Thẳng Trong Mặt Phẳng Oxy