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x² = (x - 7)² + (x - 14)²
x² = x² - 14x + 49 + x² - 28x + 196
x² = 2x² - 42x + 245
0 = 2x² - x² - 42x + 245
0 = x² - 42x + 245
0 = (x - 35) (x - 7)
x - 35 = 0 atau x - 7 = 0
x = 35 atau x = 7 (tak memenuhi)
untuk x = 35 ---> AC = x - 7
= 35 - 7
= 28 cm