Question

Resolva as equaçoes

a) x^2+×=0
b)3x^2+7×=0
c)5×^2-×=0
d)-3×^2+15×=0

Answer 1

a) x = 0, x = - 1
x² + x = 0
x (x + 1) = 0

x = 0

x + 1 = 0
x = - 1

b) x = 0, x = - 7/3
3x² + 7x = 0
x (3x + 7) = 0

x = 0

3x + 7 = 0
3x = - 7
x = - 7/3

c) x = 0,x = 1/5
5x² - x = 0
x (5x - 1) = 0

x = 0

5x - 1 = 0
5x = 1
x = 1/5

d) x = 0, x = 5
- 3x² + 15x = 0
x (- 3x + 15) = 0

x = 0

- 3x + 15 = 0
- 3x = - 15
x = - 15/- 3
x = 5