Question

9x^2-12x+4=0


-4x^2-12x+7=0

Answer 1

9x²-12x+4=0
(3x-2)²=0
3x-2=0
3x=2
x=2/3

-4x²-12x+7=0
4x²+12x-7=0
D=144+112=256
x1=(-12-16)/8=-3,5
x2=(-12+16)/8=0,5