Simplify the following expressions:
(A) $7 i^{2}$
(B) $- 6 i^{8}$
(C) $8 i^{7}$

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Solution

$i^{2} = - 1$ and $i^{4} = 1$
$7 i^{2} = 7 (- 1) = - 7$
$- 6 i^{8} = - 6 (1) = - 6$
$8 i^{7} = 8 (- i) = - 8 i$

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