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

Find f(5) and g(-5)
Simplify your answer as much as possible.

1 answer

To find f(5), substitute 5 into the function f(x) = -3x + 4:

f(5) = -3(5) + 4
f(5) = -15 + 4
f(5) = -11

Therefore, f(5) = -11.

To find g(-5), substitute -5 into the function g(x) = 4x^2 - x:

g(-5) = 4(-5)^2 - (-5)
g(-5) = 4(25) + 5
g(-5) = 100 + 5
g(-5) = 105

Therefore, g(-5) = 105.