If \(\sqrt{x^2 + 9}\) = x + 1, solve for x

A.

5

B.

4

C.

3

D.

2

E.

1

View answer & explanation

Correct answer is B

\(\sqrt{x^2 + 9}\) = x + 1

x2 + 9 = (x + 1)2 + 1

0 = x2 + 2x + 1 - x2 - 9

= 2x - 8 = 0

2(x - 4) = 0

x = 4

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