Question

Resolva as equações incompletas do 2º grau do tipo ax² + bx = 0

a) 6x² + 24x = 0

b) x² + 6x = 0

c) 8x² - 4x = 0

d) 3x² + 30x = 0

Answer 1

a) x . (6x + 24) = 0
x' = 0

6x" + 24 = 0
6x" = -24
x" = -24/6
x" = -4

b) x . ( x + 6 ) = 0
x' = 0

x" + 6 = 0
x" = -6

c) x . ( 8x - 4 ) = 0
x' = 0

8x" - 4 = 0
8x" = 4
x" = 4/8
x" = 1/2

d) x . (3x + 30) = 0
x' = 0

3x" + 30 = 0
3x" = -30
x" = -30/3
x" = -10