Basic College Mathematics (9th Edition)

$(-2)^{4} -7 = 9$
1. Complete the exponents first 2. Then subtract the values $= (-2)^{4} -7$ $= [(-2) \times (-2) \times (-2) \times (-2)] - 7$ $= [4 \times 4] - 7$ $= 16 - 7$ $= 9$