Respostas

2014-08-03T14:40:27-03:00
2x(x+1)-x(x+5)=3(12-x)
2x^2+2x-x^2-5x=36-3x
x^2-36=0
delta=0+144
delta=144
raiz de delta=12
x'=0+12/2
x'=6
x"=0-12/2
x"-6
espero ter ajudado
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