Question

Preciso de ajuda

(2x+1)(x-1)=2

Answer 1

(2x+1)(x-1)=2

2x²-2x+x-1=2

2x²-x-1-2=0

2x²-x-3=0

∆=(-1)²-4(2)(-3)

∆=1+24

∆=25

x'=1+5/4 = 6/4 = 3/2

x"= 1-5/4 = -4/4 = -1

s={3/2 , -1}