Question

13-Resolva as equações em R.
(A) X² – 64 =0
(B) X2 - 36 = 0
(C) X? -5x = 0
(D) 9x2 - 16 = 0
(E) 2x2 - 4x = 0​

Answer 1

(A) X² – 64 =0

x²= 64

x= ± √64

x= ± 8

S= ( 8 , - 8)

(B) X² - 36 = 0

x²= 36

x= ± √36

x= ± 6

S= ( 6 , - 6)

(C) X² -5x = 0

x • (x - 5) = 0

x= 0

x - 5 = 0

x= 5

S= ( 0 , 5)

(D) 9x² - 16 = 0

9x² = 16

x²= 16/9

x= ± √16/9

x= ± 4/3

S= (4/3 , - 4/3)

(E) 2x² - 4x = 0

2x • (x - 2 ) = 0

x= 0

2x - 4 = 0

2x = 4

x= 4/2

x= 2

S= ( 0 , 2)