x = [ 5 ±√(25) ] / 2
x = 10 / 2 , x = 0
x = 5 , x = 0
Can also be solved using:-
(x) (x - 5) = 0
x = 0 , x = 5 as above.
2007-09-07 03:42:16
·
answer #1
·
answered by Como 7
·
1⤊
0⤋
well you don't have to do the quadratic formula to solve this one.
x(x - 5) = 0
x = 0, 5
using the formula: a = 1 b = -5 c = 0
x = 5 +- sqrt(25 - 4(1)(0))
-------------------------------------
2(1)
x = (5 +- sqrt(25)) / 2
x = (5 +- 5)/2
x = 10/2 = 5
x = 0/2 = 0
2007-09-07 02:17:14
·
answer #2
·
answered by Becky M 4
·
1⤊
0⤋
x^2 - 5x = 0 ==> x(x-5) = 0, therefore:
x1=0, x2=5.
Quadratic formula:
x1,2 = (-b +- SQRT(b^2-4ac))/2a
where:
SQRT means square root
a=1, b=5, c=0
Substitute into the equation:
x1,2 = ((5 +-SQRT(25-4*1*0))/2 ==>
x1,2 = ((5 +-SQRT(25))/2 ==>
x1,2 = (5 +-5)/2
x1 = (5+5)/2 = 10/2 = 5
x2 = (5-5)/2 = 0/2 = 0
2007-09-07 02:30:20
·
answer #3
·
answered by Anthony P - Greece 2
·
1⤊
1⤋
Using the quadratic formula on this problem is totally lame. But since you asked, here is goes..
If ax^2 + bx + c = 0
then x = [-b +/- sqrt(b^2 - 4ac)]/(2a)
For your problem a = 1, b = -5, c = 0 so
b^2 - 4ac = 25 - 0 = 25
sqrt(b^2 - 4ac) = +/-5
then x = [5 +/- 5]/2
So x = 0 or x = 5
2007-09-07 02:57:50
·
answer #4
·
answered by Anonymous
·
0⤊
2⤋
You do realize that you can solve it easier via factoring, right? That said, and mentioning that your "c" = 0,
x = (-b +/- SQRT(b^2 - 4ac)) / 2a ==
x = (-(-5) +/- SQRT((-5)^2 - 4(1)(0)) / 2(1) ==
x = (5 +/- SQRT(25 - 0)) / 2 ==
x = (5 +/- 5) / 2 ==
x = (0, 5)
2007-09-07 02:19:41
·
answer #5
·
answered by Gary H 6
·
1⤊
0⤋
x² - 5x =0
==> x(x - 5) = 0
x = 0
-or-
x - 5 = 0
==> x = 5
So: x = 0, 5
:)
2007-09-07 02:18:58
·
answer #6
·
answered by Anonymous
·
0⤊
1⤋
x^2 - 5x =x * (x-5)
The condition
x * (x-5)=0
can be met when x=0 or when x=5
2007-09-07 02:16:36
·
answer #7
·
answered by Jan W 1
·
0⤊
2⤋