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sacas mínimo:
(x+a)(x+a)-(x-a)(x-a) 2xa+a²b
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(x-a)(x+a) (x²-a²)
x²+2ax+a² - x²+2ax-a² 2ax+a²b
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(x²-a²) (x²-a²)
4ax=2ax+a²b
4ax-2ax=a²b
2ax=a²b
2x=ab
x=ab/2