Question

The product of $(a+b)$ and 7$a^2$$b^2$ is .

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

Answer 1

The correct option is B $7a^3{b}^2+7a^2{b}^3$

$7a^2{b}^2(a+b)=(7a^2{b}^2\times a)+(7a^2{b}^2\times b)=7a^3{b}^2+7a^2{b}^3$