Questions: For f(x)=5x-3 and g(x)=2x^2-5, find the following functions.
a. (f∘g)(x); b. (g∘f)(x); c. (f∘g)(2); d. (g∘f)(2)
a. (f∘g)(x)=10x^2-28 (Simplify your answer.)
b. (g∘f)(x)=50x^2-60x+13 (Simplify your answer.)
c. (f∘g)(2)=12 (Simplify your answer.)
d. (g∘f)(2)= (Simplify your answer.)
Transcript text: For $f(x)=5 x-3$ and $g(x)=2 x^{2}-5$, find the following functions.
a. $(f \circ g)(x) ;$ b. $(g \circ f)(x) ;$ c. $(f \circ g)(2) ; d .(g \circ f)(2)$
a. $(f \circ g)(x)=10 x^{2}-28$ (Simplify your answer.)
b. $(g \circ f)(x)=50 x^{2}-60 x+13$ (Simplify your answer.)
c. $(f \circ g)(2)=12$ (Simplify your answer.)
d. $(g \circ f)(2)=$ $\square$ (Simplify your answer.)
Solution
Solution Steps
Step 1: Find the composite function (f o g)(x)
To find \((f \circ g)(x)\), we substitute \(g(x) = 2_x^2-5\) into \(f(x) = 5_x-3\).
This gives us \((f \circ g)(x) = 5_(2_x^2-5)-3\).
Evaluating this at \(x = 2\), we get \((f \circ g)(2) = 12\).
Step 2: Find the composite function (g o f)(x)
To find \((g \circ f)(x)\), we substitute \(f(x) = 5_x-3\) into \(g(x) = 2_x^2-5\).
This gives us \((g \circ f)(x) = 2_(5_x-3)^2-5\).
Evaluating this at \(x = 2\), we get \((g \circ f)(2) = 93\).
Final Answer:
The value of \((f \circ g)(2)\) is 12, and the value of \((g \circ f)(2)\) is 93.