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bxh=65
b= 8+h
h= b -8
sustituir :
(8+h)(h)=65
8h +h^2 =65
h^2 + 8h =65
h^2+8h-65=0
sustituyes
x= -(8) +- raiz / (8)^2 -4 (1)(-65) entre 2(1)
×=-8 +- / 64 +260 entre 2
x = -8 +- / 324 entre 2
×= -8 +-18 entre 2
x1 = -26/2 = -13
×2 = 10/2
×2=5