Теңдеу дискримант -4x2-12x+7=0

Question

1)-4x²-12x+7=0

2)9x²-12x+4=0

Answer 1

1)D=144-4*(-4)*7=144+112=256=16

X₁=(12+16)/-8=28/-8=-3.5

X₂=(12-16)/-8=-4/-8=0.5

 

2)D=144-4*9*4=144-144=0

X=12/18=0.67