factorization
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Answer:
x = 1 or - 6
Step-by-step explanation:
Squaring on both sides,
x + 15 = (x + 3)²
x + 15 = x² + 6x + 9
x² + 6x - x + 9 - 15 = 0
x² + 5x - 6 = 0
x² - x + 6x - 6 = 0
x(x - 1) + 6(x - 1) = 0
(x - 1)(x + 6) = 0
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