Question

помогите (3x-1)^2=2x^2+4x+9

Answer 1

(3х-1)^2=2х^2+4х+9
9х^2-6х+1-2х^2-4х-9=0
7х^2-10х-8=0
D=10^2-4×7×(-8)=100+224=324=18^2
x1= 10+18/2×7=28/14=2
x2= 10-18/2×7= -8/14= -4/7