Question 1208333
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Problem 5


(f+g)(x) = f(x) + g(x)
(f+g)(x) = x^3-3 + 2^x
(f+g)(x) = 2^x + x^3 - 3
There's not much to do here in terms of simplification.


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Problem 6


f(x) = x^3-3
f(4) = 4^3-3
f(4) = 64-3
f(4) = 61


g(x) = 2^x
g(4) = 2^4
g(4) = 16


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Problem 7


(f+g)(x) = 2^x + x^3 - 3
(f+g)(4) = 2^4 + 4^3 - 3
(f+g)(4) = 16 + 64 - 3
(f+g)(4) = 77


Another approach.
(f+g)(x) = f(x) + g(x)
(f+g)(4) = f(4) + g(4)
(f+g)(4) = 61 + 16
(f+g)(4) = 77
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