If f(x) = x^2 + 1 and g(x) = 3x + 1, find 2·f(4).

Question

anonymous · Answer

$$f(4)=4^2+1$$

anonymous · Answer

double that to find $2f(4)$

anonymous · Answer

okay so plug 4 into the f(x) question
so (4)^2 + 1 
and then multiply teh answer by 2 and there is your answer

anonymous · Answer

Thanks!

anonymous · Answer

yea no problem! let me know if you still dont understand i'd be happy to help

anonymous · Answer

so 34 would be the answer or 18?

anonymous · Answer

34 because, after you plug in four
4 squared is 16 right? and then + 1 = 17
so what you did right there is the first part by plugging in 4 into the equation
now what you have to do is multiply 17 by 2 to get 34.
im not sure how you got 18

anonymous · Answer

well I got 34 but when I asked someone else before you started typing they said 18.. lol.. but thankyou soooo much!!!