Question

5) Resolva as seguintes equações do 2° grau,onde *b=0*,no conjunto IR:

A)x² - 169=0 b)x² - 25 =0

c)7x² - 14=0 d)3x² - 12=0

e)9x² - 49=0 f)2x² - 18=0

g)x² + 121=0 h)3x² - 27=0​

Answer 1

Resposta:

a)x² - 169=0

x²=169

x=+_V169

x=+_13

(13, -13)

b)x² - 25 =0

x²=25

x=+_V25

x=+_5

(5, -5)

c)7x² - 14=0

7x²=14

x²=14/7 =2

x=+_2

x=+-V2

(V2, - V2)

d)3x² - 12=0

3x²=12

x²=12/3= 4

x=+-V4

x=+-2

(2, -2)

e)9x² - 49=0

9x²=49

x²=V49/ V9

x²=V7 / V3

(7/3, -7/3)

f)2x² - 18=0

2x²=18

x²=18/2 =9

x=+-V9

x=+-3

(3,-3)

g)x² + 121=0

x²=121

x=+-V1 21

x=+-11

(11,-11)

h)3x² - 27=0​

3x²=27

x²=27/3=9

x=+-V9

x=+-3

(3,-3)

V=RAIZ