Question
Subtract:
$-a^2-a b$ from $b^2+a b$.

Answer

We have,
$b^2+a b-\left(-a^2-a b\right)$
$=b^2+a b+a^2+a b$
Combining the like terms.
$=b^2+a^2+a b+a b$
$=a^2+b^2+2 a b$
 

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