Question

8^-4×8^-5
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8^-12

Answer 1

8^(-4)•8^(-5)/8^(-12)=8^(-4-5)/8^(-12)=

8^(-9-(-12)=8³=64*8=512

Answer 2

$\frac{ {8}^{ - 4} \times {8}^{ - 5} }{ { {8}^{ - 12} }^{ } } = \frac{ {8}^{ - 9} }{ {8}^{ - 12} } = {8}^{3 } = 512$