Answer:
-49.
Explanation:
Convert to vertex form:
f(x) = -7x^2 - 14x - 56
= -7(x^2 + 2x + 8)
= -7 [(x + 1)^2 - 1 + 8)
= 7(x + 1)^2 - 49
- so the maximum value is -49.
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