SOLUTION: x^2 - 4x - 3= 0

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Question 631753: x^2 - 4x - 3= 0
Answer by 55305(86) About Me  (Show Source):
You can put this solution on YOUR website!
The formula for completing the square is x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+, so lets plug the numbers in where a=1, b=-4, and c=-3. So we get x+=+%28-%28-4%29+%2B-+sqrt%28+-4%5E2-4%2A1%2A-3+%29%29%2F%282%2A1%29+, which simplifies to x+=+%284+%2B-+sqrt%28+16-%28-12%29%29%29%2F2+, which simplifies to x+=+%284+%2B-+sqrt%2828%29%29%2F2+, which simplifies to x+=+%284+%2B-+2%2A+sqrt%287%29%29%2F2+, which simplifies to x+=+2+%2B-++sqrt%287%29+. I hope you can understand that!