Evaluate 7-8÷4(3^2-1)

$7 - 8 \div 4 (3^{2} - 1)$

Simplify each term.

Divide $8$ by $4$ .

$7 - 1 \cdot 2 (3^{2} - 1)$

Multiply $- 1$ by $2$ .

$7 - 2 (3^{2} - 1)$

Raise $3$ to the power of $2$ .

$7 - 2 (9 - 1)$

Subtract $1$ from $9$ .

$7 - 2 \cdot 8$

Multiply $- 2$ by $8$ .

$7 - 16$

$7 - 16$

Subtract $16$ from $7$ .

$- 9$

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