Problem

For the given functions $f$ and $g$, find the indicated composition. \[ \begin{array}{l} f(x)=x^{2}-2 x-5, \quad g(x)=x^{2}+2 x+2 \\ (f \circ g)(-4) \end{array} \] $(f \circ g)(-4)$ (A) 394 B) 336 C) 133 (D) 75

Solution

Step 1 :Find the composition of the functions: \(f(g(x))\)

Step 2 :\(f(g(x)) = f(x^2 + 2x + 2)\)

Step 3 :\(f(g(x)) = (x^2 + 2x + 2)^2 - 2(x^2 + 2x + 2) - 5\)

Step 4 :Substitute \(x = -4\) into the composed function: \(f(g(-4))\)

Step 5 :\(f(g(-4)) = ((-4)^2 + 2(-4) + 2)^2 - 2((-4)^2 + 2(-4) + 2) - 5\)

Step 6 :\(f(g(-4)) = (16 - 8 + 2)^2 - 2(16 - 8 + 2) - 5\)

Step 7 :\(f(g(-4)) = (10)^2 - 2(10) - 5\)

Step 8 :\(f(g(-4)) = 100 - 20 - 5\)

Step 9 :\(f(g(-4)) = 75\)

Step 10 :\(\boxed{75}\)

From Solvely APP
Source: https://solvelyapp.com/problems/16080/

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