Question

x²-2x=x+4 ajuda pfv !​

Answer 1

Resposta:

S={( -1 , 4)}

Explicação passo-a-passo:

x²-2x=x+4

x²-2x-x-4=0

x²-3x-4= 0

a=1 b=-3 c=-4

∆=b²-4.a.c ∆= (-3)²-4.(1).(-4) ∆=9+16

∆=25

x'=[-(-3)+√25]/2.(1) x'=[3+5]/2 x'=8/2

x'=4

x"=[-(-3)-√25]/2.(1) x"=[3-5]/2 x"=-2/2

x"=-1