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2016-02-22T17:14:04+08:00
X²+6x+9=7x+15
x²+6x-7x+9-15=0
x²-x-6=0
2016-02-22T18:47:38+08:00
(X + 3)² = 7X + 15
(X + 3)(X + 3) - 7X - 15 = 0
X² + 3X + 3X + 9 - 7X - 15 = 0
X² - X - 6 = 0
(X - 3)(X + 2) = 0

X - 3 = 0
X = 3

X + 2 = 0
X = -2