Question

Determine as raízes da equação
A) X²-7=+2
B) X²-169=0
C) X²-4X=0
D) 2X²+4X=0

Answer 1

Explicação passo-a-passo:

A.

x²–7=2

x²–7–2=0

x²–9=0

x²=9

x=±√9

x=±3

x1=–3 v x2=3

sol{–3;3}

B

x²–169=0

x²=169

x=±√169

x=±13

x1=–13 v x2=13

sol{–13;13}

C.

x²–4x=0

x(x–4)=0

x=0 v x–4=0

x=0 v x=4

sol{0;2}

D

2x²+4x=0

x(2x+4)=0

x=0 v 2x+4=0

x=0 v 2x=–4

x=0 v x=–4/2

x=0 v x=–2

sol{0;–2}