Question

What is the product of $(a+b)$ and $7a^2$$b^2$?

• A. $7a^2$$b^2$
• B. $7a^3{b}^2+7a^2{b}^3$
• C. $7a^{2}b+7a{b}^2$
• D. $7a^2$$b^3$

Answer 1

The correct option is B

$7a^3{b}^2+7a^2{b}^3$

$7a^2{b}^2(a+b)$

= ($7a^2$$b^2\times a$) + ($7a^2{b}^2\times b$)

= $7a^3{b}^2+7a^2{b}^3$