Question

expand using suitable identity (2x-7x) ²

Answer 1

Hiii Mate

Here Is Answer To Your Question

By Using (A-B)^2 = A^2-2AB+B^2

=(2X)^2-2(2X)(7X)+(7X)^2

=4X^2-28X^2+49X^2

Hope It Helped You

Regards Vishal__________(BhamBhamBhole)

Answer 2

Hello ,

Use
$( a - b) ^{2} = {a}^{2} - 2ab + {b}^{2}$
Here ,
a = 2x
b = 7x

$(2x - 7x)^{2} = 4 {x}^{2} - 28 {x}^{2} + 49x^{2}$

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