For the given functions f and g, find the requested function and state its domain.f(x) = x + 1; g(x) = 9x2Find f + g.
A. (f + g)(x) = -9x2 + x + 1; (-?, ?)
B. (f + g)(x) = 9x2 - x - 1; (-?, ?)
C. (f + g)(x) = 9x2 + x + 1; (-?, -1) ? (-1, ?)
D. (f + g)(x) = 9x2 + x + 1; (-?, ?)
Answer: D
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