Question

2)X²-8X+12=0
3)X²+2X-8=0
4)2X²-8X+8=0
5)X²-4X-5=0
6)3X²-7X+2=0

Answer 1

2)X²-8X+12=0 ==> x1 = 6  e x2 = 2
3)X²+2X-8=0==> x1= - 4 e x2 = - 2
4)2X²-8X+8=0==> x1 = x2 = 2
5)X²-4X-5=0==> x1 = 5 e x2 = - 1 
6)3X²-7X+2=0==> x1=2 e 1/3