32. Evaluating composifion of functions use \( f(x)=4 x+5 \) and \( g(x)=x^{2}+2 \) to evaluate the expression. \( \begin{array}{ll}\text { a) }(f \circ f)(x) & \text { b) }(g \circ g)(x)\end{array} \)
Upstudy AI Solution
Answer
Solution

Sign in to Unlock Answers for Free!
A Learning Platform Trusted by Millions of Real Students and Teachers.

Answered by UpStudy AI and reviewed by a Professional Tutor
Mind Expander
To evaluate \( (f \circ f)(x) \), we first find \( f(f(x)) \). So we start with \( f(x) = 4x + 5 \). Plugging \( f(x) \) into itself gives us: \[ f(f(x)) = f(4x + 5) = 4(4x + 5) + 5 = 16x + 20 + 5 = 16x + 25. \] For \( (g \circ g)(x) \), we find \( g(g(x)) \). We know \( g(x) = x^2 + 2 \), so we substitute \( g(x) \) into itself: \[ g(g(x)) = g(x^2 + 2) = (x^2 + 2)^2 + 2 = x^4 + 4x^2 + 4 + 2 = x^4 + 4x^2 + 6. \] In summary, we have: a) \( (f \circ f)(x) = 16x + 25 \) b) \( (g \circ g)(x) = x^4 + 4x^2 + 6 \).