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Composition of Functions

4. Graphs and Functions / Composition of Functions / 문제 3

문제 3

Let $f (x) = x^{2}$ and $g (x) = x + 1$ . Solve $open paren f composed with g close paren of x equals 10$ for $x$ .

A

$x = 1 \pm \sqrt{10}$

B

$x = - 1 \pm \sqrt{10}$

C

$x = - 1$

D

$x = \pm \sqrt{10}$