Question

Resolva as equações incompletas: (b = 0) a) x2 + 2 = 0 b) x2 – 16 = 0 c) 2x 2 - 8 = 0 d) x 2 – 49 = 0

Answer 1

Resposta:

V=raiz

a) x2 + 2 = 0

x^2-2+2=0+2

x^2=2

x= + V2 ; -V2

b) x2 – 16 = 0

x^2-16+16=0+16

x^2= 16

x= V16= 4 ou x= -V16= -4

c) 2x 2 - 8 = 0

2x2-8+8= 0-8

2x^2=8

x^2=8/2

x^2=4

x= V4= 2 ; x= - V4= - 2

d) x 2 – 49 = 0

x^2-49+49=0+49

x^2=49

x^2=V49

x= V49 = 7 ; x= - V49= -7