Respostas

2014-07-13T12:21:48-03:00
A)x²+2x+1 ∆=2²-4.1.1 ∆=4-4 ∆=0 x'=-2+√0/2.1=-2+0/2=2/2=1 x''=-2-√0/2.1=-2-0/2=2/2=1 ------------------------ b)7x²-8x+3 ∆=(-8)²-4.7.3 ∆=64-84 ∆=-20 x'=-(-8)+√20i/2.7=8+√20i/14 x''=-(-8)-√20i/2.7=8-√20i/14