Question

3
$3 {x}^{2} - x = 2 {x}^{2} + 2$

Answer 1

Olá,

3x²-x=2x²+2
3x²-x-2x²-2=0
x²-x-2=0

a= 1
b= -1
c= -2

x=-b±√b²-4ac/2a
x=-(-1)±√(-1)²-4×1×(-2)/2×1
x=1±√1+8/2
x=1±√9/2
x=1±3/2
x'=1+3/2
x'=2
x"=1-3/2
x"=-1

S={-1;2}

Espero ter te ajudado!