Question

1- Resolva as equações:
a)x² -4 = 0
b)x² 100 = 0
c)x² - 81 = 0
d)x²- 3 = 0
e)x² - 121 = 0​

Answer 1

Resposta:

–b + √ b² – 4ac

a) x=________________

2a

x² – 4=0

a=1

b=0

c= –4

–0 + √ 0² – 4 . 1 (–4)

x=__________________

2 . 1

x=2

x=–2

b)x² – 100=0

x² = 100

x= + – √100

x – + – 10

x¹= –10

x² – 10

c) x²= +81

x = + √81

x= + 9

S{-9 ; + 9}

–b + √b² – 4ac

d) x=_______________

2a

x² – 3= 0

a= 1

b= 0

c= –3

–0 + √0² – 4 . 1(–3)

x=__________________

2 . 1

x= + √3

e)x² - 121=0

x² =121

x=√121

x= +/-11

R.: x = 11 e x = –11

espero ter ajudado!!!!