2(х+1)-(3х-4)(1+2х)=8х-1

Question

2(х+1)-(3х-4)(1+2х)=8х-1

Answer 1

2x+2-3x-6x²+4+2x-8x+1=0
-6x²-7x+7=0 | *(-1)
6x²+7x-7=0
D=b²-4ac=49-4*6*(-7)=49+168=217
√D= √217=

x₁,₂=-7±√217/12