Question

Simplify b ( a + b ) - a ( a - b ).

Answer 1

Answer:

-a^2 + 2 ab + b^2

Step-by-step explanation:

To solve this, you need to distribute the letters into the parenthesis.

Then, you sum equal things, and you get the result.

$b(a+b)-a(a-b)=\\ba + b^{2} -a^{2} + ab=\\ b^{2} + 2ab -a^{2}$

So, the rigth answer is number three: -a^2 + 2 ab + b^2

Answer 2

The answer is -a^2+2ab+b^2