SOLUTION: Suppose that the functions q and r are defined as follows. q(x)=2x+4 r(x)=-4x-5 Find: (r ∘ q)(-4) (q ∘ r)(-4)

Algebra ->  Functions -> SOLUTION: Suppose that the functions q and r are defined as follows. q(x)=2x+4 r(x)=-4x-5 Find: (r ∘ q)(-4) (q ∘ r)(-4)      Log On


   

Question 1123469: Suppose that the functions q and r are defined as follows.
q(x)=2x+4
r(x)=-4x-5
Find:
(r ∘ q)(-4)
(q ∘ r)(-4)
Answer by josgarithmetic(39613) About Me  (Show Source):
You can put this solution on YOUR website!
These are a matter of substituting the input of each function.

r%28q%28x%29%29=-4%282x%2B4%29-5
Simplify this.
Substitute -4 for x, and evaluate.

q%28r%28x%29%29=2%28-4x-5%29%2B4%29
Simplify this.
Substitute -4 for x, and evaluate.