Answer:
a) f(3) = -19
b) x = -2 (I assume you have to find x, but the question isn't very clear)
Explanation:
a) f(3) = -4(3) - 7 = -12 - 7 = -19
b) Suppose f(x) = 1. Then 1 = -4x - 7, so -4x = 8, and thus x = -2
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