2006-12-27 14:59:11 · 11 answers · asked by styles4u 4 in Science & Mathematics ➔ Mathematics
OK!
4x^2 + 8x = 0
divide through by 4
x^2 + 2x =0
factor out the x
x (x+2)=0
So, x=0 and x=-2
Done!
2006-12-27 15:00:41 · answer #1 · answered by Jerry P 6 · 5⤊ 0⤋
4x² + 8 = 0
4x(x + 2) . . . .Common factor is 4x
- - - - - - -
4x = 0
4x / 4 = 0 / 4
x = 0
The answer is x = 0
Insert the x value into the equation
- - - - - - - - -
x + 2 = 0
x + 2 - 2 + 0 - 2
x = - 2
The answer is x = - 2
Insert the x value into the equation
- - - - - - - - - - - - - - - - - - - - - -
Check of x = 0
4x² + 8x = 0
4(0) ² + 8(0) = 0
4(0) + 0 = 0
0 + 0 = 0
0 = 0
- - - - - - - - - - -
Check for x = - 2
4x² + 8x = 0
4(- 2)² + 8(- 2) = 0
4(4) + (- 16) = 0
16 - 16 = 0
0 = 0
- - - - - - - -s-
2006-12-27 23:23:40 · answer #2 · answered by SAMUEL D 7 · 1⤊ 0⤋
x = -2 x = 0
2006-12-27 15:01:45 · answer #3 · answered by Anonymous · 3⤊ 0⤋
Factor out 4x:
4x(x+2)=0
4x=0
x+2=0
x=0 or -2
Check:
4(0)^2+8(0)=0
0=0
4(-2)^2+8(-2)=0
4(4)-16=0
16-16=0
0=0
2006-12-27 15:45:15 · answer #4 · answered by Anonymous · 2⤊ 0⤋
0 and -2
2006-12-27 15:02:28 · answer #5 · answered by ¥¥Z 4 · 3⤊ 0⤋
4x^2+8x = 0
4x(x+2) = 0
x+2 = 0
x = -2; x=0
2006-12-27 15:48:13 · answer #6 · answered by dean392 1 · 3⤊ 0⤋
x=0 or -2
2006-12-27 15:01:52 · answer #7 · answered by RepoMan18 4 · 3⤊ 0⤋
4x2 + 8x = 0 (divide by 4x)
x + 2 = 0
x = -2 ; x = 0
2006-12-27 15:09:44 · answer #8 · answered by Colorado 4 · 3⤊ 0⤋
4x(x+2) =0
x=0
x=-2
2006-12-27 15:01:07 · answer #9 · answered by adrian b 3 · 3⤊ 0⤋
4x^2 + 8x = 0
By factorising ....
4x (x + 2) = 0
So, x = 0 or -2
2006-12-27 15:34:10 · answer #10 · answered by Srinivas c 2 · 3⤊ 0⤋