Question

Write out step by step what needs to be done in order to get the answer to the expression open square brackets 9 plus 2 open parentheses 3 squared minus 10 close parentheses close square brackets plus 7

Answer 1

We must compute the result of the following expression:

$\lbrack9+2(3^2-10)\rbrack+7$

We get to the result doing the following steps:

$\begin{gathered} \lbrack9+2(3^2-10)\rbrack+7 \\ =\lbrack9+2(9^{}-10)\rbrack+7 \\ =\lbrack9+2\cdot(-1)\rbrack+7 \\ =\lbrack9-2\rbrack+7 \\ =7+7 \\ =14 \end{gathered}$