Question

$log3(2 x^{2} +x-1)=2$

Answer 1

9=(2x la patrat + x - 1) 
2x la patrat + x - 1 - 9=0
x(2x+1)-10=0
(2x+1)(9x-10)=0

2x+1=0 => 2x= -1 => x= -1/2
9x-10=0 => 9x=10 => x=10/9