Question

x²-5x=0
9x²-4=0
x²+12=0
5x²-20x=0
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Answer 1

x²-5x=0

x • (x - 5) = 0

x= 0

x - 5 = 0

x= 0 + 5

x= 5

S= ( 0 , 5)

9x²-4=0

9x²= 0 + 4

9x²= 4

x²= 4/9

x= ± √4/9

x= ± 2/3

S= (2/3 , - 2/3)

x²+12=0

x²= 0 - 12

x²= - 12

x= ± √- 12

Não existe raízes reais.

S= { }

5x²-20x=0

5x • (x - 4) = 0

x= 0

5x - 20 = 0

5x= 0 + 20

5x= 20

x= 20/5

x= 4

S= ( 0 , 4)