SOLUTION: Solve 1/3x2-1/2x=1/6. The 2 beside the 1/3x is supposed to represent squared.

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Question 77053: Solve 1/3x2-1/2x=1/6. The 2 beside the 1/3x is supposed to represent squared.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Solve 1/3x2-1/2x=1/6. The 2 beside the 1/3x is supposed to represent squared.
:
(1/3)x^2 - (1/2)x = 1/6
:
Get rid of those denominators, multiply equation by 6 and you have:
2x^2 - 3x = 1
:
2x^2 - 3x - 1 = 0; subtracted 1 from both sides, a quadratic equation
:
Use the quadratic formula to find x; a=2; b=-3; c = -1
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
:
x+=+%28-%28-3%29+%2B-+sqrt%28+%28-3%29%5E2+-+4+%2A+2+%2A+-1+%29%29%2F%282%2A2%29+
:
x+=+%28%2B3+%2B-+sqrt%28+9+-+%28-8%29+%29%29%2F%284%29+
:
x+=+%28%2B3+%2B-+sqrt%28+9+%2B+8+%29%29%2F%284%29+
:
x+=+%28%2B3+%2B-+sqrt%2817%29%29%2F%284%29+
:
x+=+%28%2B3+%2B-+sqrt%28+9+-+%28-8%29+%29%29%2F%284%29+
:
x+=+%28%2B3+%2B-+sqrt%28+9+%2B+8%29%29%2F%284%29+
:
x+=+%28%2B3+%2B-+sqrt%2817%29%29%2F%284%29+
:
x+=+%28%2B3+%2B+4.123%29%2F%284%29+: 1st solution
:
x+=+7.123%2F4
x = +1.78
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x+=+%28%2B3+-4.123%29%2F%284%29+: 2nd solution
:
x+=+%28-1.123%29%2F%284%29+
x = -.28
:
Check x = 1.78 in the original equation:
(1/3)1.78^2 - (1/2)1.78 = 1/6
(1/3)3.17 - (1/2)1.78 = 1/6
1.056 - .89 = .166 which is about 1/6
:
I'll let you check the x = -.28 solution