SOLUTION: Use the Quadratic Formula to solve the equation. –x^2 + 7x = 8 Help please. Thanks!

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons -> SOLUTION: Use the Quadratic Formula to solve the equation. –x^2 + 7x = 8 Help please. Thanks!      Log On


   

Question 687803: Use the Quadratic Formula to solve the equation.
–x^2 + 7x = 8
Help please. Thanks!
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
Compare to ax%5E2+%2B+bx+%2B+c+=+0
...
-x%5E2+%2B+7x+-8+=+0
a = -1, b = 7, c = -8
...
quadratic formula
x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F2a%29
...
x+=+%28-7+%2B-+sqrt%287%5E2-4%28-1%29%28-8%29%29%29%2F%282%2A-1%29
...
x+=+%28-7+%2B-+sqrt%2849+-+32%29%29%2F-2
...
x+=+%28-7+%2B-+sqrt%2817%29%29%2F-2
...
x+=+%28-7%2Bsqrt%2817%29%29%2F-2+=+-7%2F-2+%2B+sqrt%2817%29%2F-2+=+7%2F2+-+sqrt%2817%29%2F2
AND
x+=+%28-7-sqrt%2817%29%29%2F-2+=+-7%2F-2+-+sqrt%2817%29%2F-2+=+7%2F2+%2B+sqrt%2817%29%2F2
………………………
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