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x² = x²+49-2.7.x + x²+196-2.14.x
x² = 2x² + 245 -14x - 28x
x² = 2x² - 42x + 245
0 = x² - 42x + 245
(x-7) (x-35)
x= 7 atau x= 35
jadi, AC = 7-7 = 0
atau 35-7= 28 cm
semoga membantu :D