If f(x) = x 2 + 1 and g(x) = 3x + 1, find f(-1) + 5g(-3).

Question

.sam. · Answer

If
$$f(x) = x^2 + 1$$
$$f(-1) = (-1)^2 + 1$$
----------------------
$$g(x) = 3x + 1$$
$$g(-3) = 3(-3) + 1$$
================
Then
$$f(-1)+5g(-3)$$
$$=((-1)^2+1)+5(3(-3)+1)$$

whitakerjasmine09 · Answer

i dont get it

.sam. · Answer

If f(x) = x^2 + 1, when x=-1, the function
f(-1) will be equal to $(-1)^2+1$
Same for g(x),
If g(x) = 3x+1, when x=-3, the function 
g(-3) will be equal to $3(-3)+1$

.sam. · Answer

You've been asked to find f(-1) + 5g(-3).
So, we knew f(-1) is $(-1)^2+1$ and g(-3) is $3(-3)+1$

$$f(-1)+5g(-3) \ \ =(-1)^2+1+5(3(-3)+1) \ \ =?$$