Question

Resolva em R as equações incompletas abaixo.

a) x^2-3x=0
b) 2x^2-8=0
c) 5x^2+6x=0
d) x^2+4=0​

Answer 1

A) x^2-3x=0

x^2 - 3x = 0

x(x - 3) = 0

x = 0

x = 3

B) 2x^2-8=0

2x^2 - 8 = 0

x^2 - 4 = 0

(x - 2) (x+2) = 0

x = 2

x = -2

C) 5x^2+6x=0

5x^2 + 6x = 0

x(5x + 6) = 0

x = 0

x = - 6/5

D) x^2+4=0

x^2 + 4 = 0

x^2 = -4

x = 2i

x = -2i