SOLUTION: 10xsuared-2x-4=0 How do i work that out

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Question 25133: 10xsuared-2x-4=0
How do i work that out
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Solve:
10x%5E2+-+2x+-+4+=+0 Factor a 2.
2%285x%5E2+-+x+-+2%29+=+0 Use the quadratic formula:x=%28-b%2B-sqrt%28b%5E2-4ac%29%2F2a%29
x=%28-%28-1%29%2B-sqrt%28%28-1%29%5E2-4%285%29%28-2%29%29%2F2%285%29%29
x=%281%2B-sqrt%281-%28-40%29%29%2F10%29
x=%281%2B-sqrt%2841%29%29%2F10
Solution:
x+=+%281%2Bsqrt%2841%29%29%2F10
x+=+%281-sqrt%2841%29%29%2F10