Question

Resolva as equações.
A)x²+x=0
B)5x²-x=0
C)5x²-x=0
D)-3x²+15x=0

Answer 1

A)x²+x=0

x • (x + 1) = 0

x= 0

x + 1 = 0

x= 0 - 1

x= - 1

S= ( 0 , - 1)

B)5x²-x=0

x • (5x - 1) = 0

x= 0

5x - 1 = 0

5x= 0 + 1

5x = 1

x= 1/5

S= ( 0 , 1/5)

D)-3x²+15x=0

3x • ( - x + 5) = 0

x= 0

- 3x + 15 = 0

- 3x = 0 - 15

- 3x = - 15 (-1)

3x = 15

x= 15/3

x= 5

S= ( 0 , 5)