• ## Discover

1. Home >
2. All Categories >
3. Science & Mathematics >
4. Mathematics >
5. Resolved Question
Member since:
May 24, 2009
Total points:
101 (Level 1)

## Resolved Question

Show me another »

# Porfavor me ajudem resolver as equações do 2º grau incompleta ?

4x² - 64 = 0

4x² - 324 = 0

6x² - 24 = 0

2x² - 32 = 0

x²- 32 = 0

x² - 16/9 = 0

5x² - 45 = 0

10x² = 810
by Estela
Member since:
January 14, 2009
Total points:
3,715 (Level 4)

## Best Answer - Chosen by Voters

a) 4x² - 64 = 0
4x² = 64
x² = 64/4
x² = 16
x = 4

b) 4x² - 324 = 0
4x² = 324
x² = 324/4
x² = 81
x = 9

c) 6x² - 24 = 0
6x² = 24
x² = 24/6
x² = 4
x = 2

d) 2x² - 32 = 0
2x² = 32
x² = 32/2
x² = 16
x = 4

e) x² - 32 = 0
x² = 32
x = 5,65685425 (?)

f) x² - 16/9 = 0
x² = 16/9
x = 4/3

g) 5x² - 45 = 0
5x² = 45
x² = 45/5
x² = 9
x = 3

h) 10x² = 810
x² = 810/10
x² = 81
x = 9

There are currently no comments for this question.

This question about "Porfavor me ajudem r… " was originally asked on Yahoo Answers Brazil

### Other Answers (3)

• Member since:
July 23, 2006
Total points:
104,350 (Level 7)
a)4( x² - 16 ) = 4( x+4)(x-4) 0u
x³ - 16 = 0
x² = 16
x = +-4
b) 4( x² - 81) = 4(x+9)(x-9) ou
x² - 81 = 0
x² = 81
x = +-9
c) 6( x²-4) = 6(x+2)(x-2) ou
x² - 4 = 0
x² = 4
x = +-2
d) 2( x² - 16) = 2( x+4)(x-4) ou
x² - 16 = 0
x² = 16
x = +-4
e) x² = 32 ou x² - 32 = 0 ou Vx² = V32 ou x = V2²*2²* 2
ou x = 4V2
f) ( x + 4/3)(x-4/3) ou
x² - 16/9 = 0
x² = 16/9
x = +- 4/3
g) 5( x² - 9 ) = 5( x+3)(x-3) ou
x² - 9 = 0
x² = 9
x = +- 3
h) 10( x² - 81) = 10( x+9)(x-9 ) ou
x² - 81 = 0
x² = 81
x = +- 9
33% 1 Vote
• by maripim
Member since:
March 20, 2009
Total points:
347 (Level 2)
4x² - 64 = 0 --------- x² = 64/4 --> x² = 16 --> x = 4

4x² - 324 = 0 ------- x² = 324/4 --> x² = 81 -- > x = 9

6x² - 24 = 0 ------- x² = 24/6 ---> x² = 4 --> x = 2

2x² - 32 = 0 ------- x² = 32/2 --> x² = 16 --> x = 4

x² - 16/9 = 0 ------- x² = 16/9 --> x = 4/3

5x² - 45 = 0 ------ x² = 45/5 ---> x² = 9 --> x = 3

10x² = 810 ------- x² = 810/10 --> x² = 81 --> x=9
• Member since:
January 03, 2007
Total points:
1,192 (Level 3)
4x²=64 x²=64/4 = x²=16 = x=4
4x²=324 x²=324/4 = x²=81 = x=9
6x²=24 x²=24/6 = x²=4 = x=2
2x²=32 x²=32/2 = x²=16 x=4
x²=32 x= 5,66
x2 =16/9 x=4/3
5x²=45 x²=9 = x=3
10x²=810 x²=81 x²=9