Question

Find the product of (3x + 7y)2. 9x2 − 42xy + 49y2 9x2 − 49y2 9x2 + 49y2 9x2 + 42xy + 49y2

Answer 1

using(a+b)^2 = a^2 + 2ab = b^2

so

(3x + 7y)^2
= 9x^2 + 42xy + 49y^2

answer
9x^2 + 42xy + 49y^2

Answer 2

`9x^(2)+42xy+49y^(2)`

Explanation:

we know that

`(a+b)^(2)=a^(2)+2ab+b^(2)`

In this problem we have

`(3x+7y)^(2)`

so

`a=3x`

`b=7y`

substitute

`(3x+7y)^(2)=(3x)^(2)+2(3x)(7y)+(7y)^(2)`

`=9x^(2)+42xy+49y^(2)`