Question

Expand. (4x-7y)(4x-7y)

Answer 1

(4x-7y)(4x-7y

=(4x-7y)^2

= 16x^2 + 49y^2 - 56xy answer.

using identity

(a-b)^2=a^2 +b^2 -2 ab .

Answer 2

(4x - 7y)(4x - 7y) = 16x² - 56xy + 49y²

Given :

The expression (4x - 7y)(4x - 7y)

To find :

Expand the expression

Solution :

Step 1 of 2 :

Write down the given expression

The given expression is

(4x - 7y)(4x - 7y)

Step 2 of 2 :

Expand the expression

$\sf (4x - 7y)(4x - 7y)$

$\sf = 4x (4x - 7y)- 7y(4x - 7y)$

$\sf = 16 {x}^{2} - 28xy - 28xy + 49 {y}^{2}$

$\sf = 16 {x}^{2} - 56xy + 49 {y}^{2}$

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