Question

Expand the following
(2x + 7y)^2​

Answer 1

(2x+7y)

2

is of the form (a+b)

2

=a

2

+b

2

+2ab

where a=2x,b=7y

∴(2x+7y)

2

=(2x)

2

+(7y)

2

+2×2x×7y

=4x

2

+49y

2

+28xy

Answer 2

So your final answer is

(2x + 7y)²= 4x² + 28xy + 49y²

I hope you get your answer

thnx for asking