Question

calcular as raizes das equações abaixo:
a)x^2 + 9x = 0
b)3x^2 - 15 = 0
c)x^2 - 15 = 0
d)2x^2 + 18x = 0
e)6x^2 + 18x = 0
f)7x^2 - 49x = 0
g)9x^2 = 0
h)15x^2 = 0
i)x^2 = 0
j)-3x^2 = 0

​

Answer 1

Resposta:

A= (0,-9)

B=(5,0)

C=(15,0)

D(0,-9)

E(0,-3)

F(7,0)

G(0,0)

H(0,0)

Explicação passo a passo:

A- x^2 + 9x = 0

delta=81-0

delta=81

x=-9 +- 9/2

x'= -9+9/2

x'=0

x''=-9-9/2

x''=-9

B-3x^2 - 15 = 0

delta=225-

x=15+-15/6

x'=15+15/6

x'=5

x''=15-15/6

x''=0

c)x^2 - 15 = 0

delta =225

x=15+-15/2

x'=15+15/2

x'=15

x''=0

d)2x^2 + 18x = 0

delta=324

x=-18+-18/4

x'=-18+18/4

x'=0

x''=-18-18/4

x''=-9

e)6x^2 + 18x = 0

delta=324

x=-18+-18/12

x'=-18+18/2

x'=0

x''=-18-18/12

x''=-3

f)7x^2 - 49x = 0

delta= 2.401

x=49+-49/14

x'=49+49/14

x'=7

x''=49-49/14

x''=0

g)9x^2 = 0

delta=0

x=-0+-0/18

x' e x''=0

h)15x^2 = 0

Delta=04

x' e x''=0