Question

Resolva as equações :
A) x²-25=0
B)2x²-98=0
C)24=6x²
D)64x²-1=0

Answer 1

A)
x² - 25 = 0
x² = 0 + 25
x² = 25
x = √25
x = +-5

B)
2x² - 98 = 0
2x² = 0 + 98
2x² = 98
  x² = 98 / 2
  x² = 49
  x = √49
  x = +-7

C)
24 = 6x²
6x² = 24
  x² = 24 / 6
  x² = 4
  x = √4
  x = +- 2

D)
64x² - 1 = 0
64x² = 0 + 1
64x² = 1
    x² = 1/64
    x = √1/64
    x = √1/√64
    x = +- 1/8

Answer 2

a)x2=25
x=√25
x=5
b)2x2=98
x2=98÷2
x2=49
x=√49
x=7
c)-6x2=-24(-1)
x2=24÷6
x2=4
x=√4
x=2
d)64x2=1
x2=64÷1
x=√64
x=8