Solve for a4 a_4=(-1)^4*4^2

$a_{4} = {(- 1)}^{4} \cdot 4^{2}$

Raise $- 1$ to the power of $4$ .

$a_{4} = 1 \cdot 4^{2}$

Multiply $4^{2}$ by $1$ .

$a_{4} = 4^{2}$

Raise $4$ to the power of $2$ .

$a_{4} = 16$

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