Question

Resolver
1- 3(x²-1)=2(x-1)²
2- 7+2x-4x(1-x)=x²-12
3- 6x²-20=x(5x+1)
4- (x-1)(x-5)-14+6x=2(3x-1)
5- 3x(3x+1)-4²x=-1
6- 2x-x²/2=4-x/3
7- x+4/5=10-x/5
8- 2x²/3-x/2=1-x/2+1

Answer 1

1°3(x²-1)=2x(x+1)
3*x²-3*1=2x*x+2x*1
3x²-3=2x²+2x
3x²-3-2x²-2x=0
x²-2x-3=0

(-2)²-4*1*(-3)
4+12=16

(2+) / 2 =3
(2- ) /2 = -1

Então x=1 ou x=3

2°7+2x-4x+4x²=x²-12
7+12=x²-2x+4x-4x²
19=-3x²+2x
-19-3x²+2x=0

3°6x²-20=5x²+x
6x²-5x²=20+x
x²-20-x=0

4°x²-5x-x+5-14+6x=6x-2
x²-6x-9-2=0

5°6x²+3x-4x²=-1
2x²+3x+1=0

Só consegui essas,desculpa