Question

Simplify :

$\left[6a-17b^2-\left\{7a-3b-(5a+5b)\right\}\right]$

Answer 1

$$\begin{gathered} =\left[6a-17b^2-\left\{7a-3b-(5a+5b)\right\}\right] \\ =\left[6a-17b^2-\left\{7a-3b-5a-5b\right\}\right] \\ =\left[6a-17b^2-7a+3b+5a\right] \\ =-17b^2+4a+3b \end{gathered}$$