2X minus eight, x minus seven equals zero solution to the equation

2x² - 8x -7 = 0
2(x² - 4x +4) -15 = 0
2(x -2)² -15 = 0
(x -2)² = ±15/2
x -2 = ±√30/2
x = 2 ±√30/2

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