Verified answer

(2х-1)(х+8)-(3х-1)²-(2х+1)=0

2х²+15х - 8 - 9х²+6х - 1 - 2х - 1=0

-7х²+19х-10=0

7х²-19х+10=0

D=19²-4*7*10=81         ( ±9²)

х₁=(19-9)/14=10/14=5/7

х₂=(19+9)/7=4

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(2х-1)(2х+1)-(4х-1)²+2(3х+4)=0

4х² - 1 - 16х²+8х - 1+6х+8=0

12х²+14х - 6=0

6х²+7х - 3=0

D=7²+4*6*3=121         ( ±11²)

х₁=(-7-11)/12= - 1,5

х₂=( -7+11)/12=1/3