Question

Resolva as equações do do segundo grau incompletas e determine x' e x''.
A) 3x²=0
B) 4x²=36
C) x² + 16x=0
D) x² + 16x=0
E) x² - 3=0
F) x² +5=0

Answer 1

a)

3x²=0

x²=-3+0

x²=-3

x=√-3

x=1,73

b)

4x²=36

x²=36-4

x²=32

x=√32

x=5,65

c)

x²+16x=0

x²+x=0-16

x²+x=-16

x+x=√-16

2x=4

x=4÷2

x=2

d)

x²+16x=0

x²+x=0-16

x²+x=-16

x+x=√-16

2x=4

x=4÷2

x=2

e)x²-3=0

x²=0-3

x²=-3

x=√-3

x=1,73

f)x²+5=0

x²=0+5

x²=5

x=√5

x=2,23