Pythagorean theorem?

Mar 2010
224
2
i know i have to use pythagorean theorem, but i can's solve it. I always get x^2 = 12x
 

mr fantastic

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i know i have to use pythagorean theorem, but i can's solve it. I always get x^2 = 12x
x^2 - 12x = 0 => x(x - 12) = 0 => x = 0 (rejected) or x = 12.