9514 1404 393
Answer:
- 261
- 27 (see comment)
- 3p^2 +22p +40
Explanation:
In each case, put the function argument where the variable is and do the arithmetic (or algebra).
a) f(-9) = 3(-9)^2 -2(-9) = 3·81 +18 = 261
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b) g(-3) = -8(-3)-(-3) = 24 +3 = 27
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c) f(p+4) = 3(p+4)^2 -2(p+4)
= 3(p^2 +8p +16) -2p -8
= 3p^2 +22p +40
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Additional comment
The form of g(x) is unusual, leading us to suspect it might be ...
g(x) = -8x^2 -x
In that case,
g(-3) = -8(-3)^2 -(-3) = -8·9 +3 = -69