SOLUTION: Please help me solve f(5) + h (5) if f(x)=7x - 40 h(x)= -x^2 + 6x

Algebra ->  Functions -> SOLUTION: Please help me solve f(5) + h (5) if f(x)=7x - 40 h(x)= -x^2 + 6x      Log On


   

Question 72595: Please help me solve
f(5) + h (5)
if
f(x)=7x - 40
h(x)= -x^2 + 6x
Answer by bucky(2189) About Me  (Show Source):
You can put this solution on YOUR website!
Given:
.
f%28x%29=7x+-+40
.
and
.
h%28x%29=+-x%5E2+%2B+6x
.
f(5) means to go to the equation for f(x) and replace all the x's with 5. When you do, then
you get:
.
f%285%29+=+7%2A5+-+40+=+35+-+40+=+-5
.
Similarly, h(5) means to go to the equation for h(x) and replace all the x's by 5. And when you,
make this substitution you get:
.
h%285%29+=+-%285%5E2%29+%2B+6%2A5+=+-25+%2B+30+=+%2B5
.
so adding f(5) to h(5) is equal to -5+%2B+5 and the result is zero.
.
So the answer to your problem is zero.
.
Hope this helps you to understand how to deal with f(x), g(x), and h(x) when numbers are
given such as f(5), g(-2), and h(0). Just plug those numbers in for x in the equations
for f(x), g(x), and h(x).