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2013-09-04T20:48:52-03:00
2013-09-04T20:50:06-03:00
20^2 = (4x)^2 + (3x)^2
400=16x^2 + 9x^2
400=25x^2
x^2=400/25
x^2=16
x= 4 ou -4

9 3 9