5
4
3
2
1
Correct answer is B
√x2+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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