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Question 799185: Hello,
I'm hoping that you can help me with a function question. I've gotten as far as what I typed below. The book shows the answer as 33. I've checked to make sure I'm looking at the correct answer for problem and am absolutely beside myself as to how they came to that answer. Here's what I've got so far. Can you please let me know if I'm on track. If not, can you tell me where I went wrong?
f(x)=X^2-3
g(x)=2x+1
Find (f+g)(5)
(x^2-3)(5) + (2x+1)(5)
5x^2-10+10X
(question does not state that I should factor at this point)
Found 2 solutions by mananth, MathTherapy:
Answer by mananth(16946)   (Show Source):
Answer by MathTherapy(10553)  (Show Source):
You can put this solution on YOUR website!
Hello,
I'm hoping that you can help me with a function question. I've gotten as far as what I typed below. The book shows the answer as 33. I've checked to make sure I'm looking at the correct answer for problem and am absolutely beside myself as to how they came to that answer. Here's what I've got so far. Can you please let me know if I'm on track. If not, can you tell me where I went wrong?
f(x)=X^2-3
g(x)=2x+1
Find (f+g)(5)
(x^2-3)(5) + (2x+1)(5)
5x^2-10+10X
(question does not state that I should factor at this point)
The biggest mistake you made was trying to do the problem without knowing what (f + g)(5) means. It means:  , so all you need to do is calculate f(5), and g(5), and add them. That's it!!
Try it and see if you get the answer.
Send comments, “thank-yous,” and inquiries to “D” at MathMadEzy@aol.com. Further help is available, online or in-person, for a fee, obviously.
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