SOLUTION: Solve the equation using the quadratic formula. x^2+11x+7=0 The solution set is { }. (Type an exact answer, using radicals as needed. Use a comma to separate answers as need

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Solve the equation using the quadratic formula. x^2+11x+7=0 The solution set is { }. (Type an exact answer, using radicals as needed. Use a comma to separate answers as need      Log On


   

Question 969616: Solve the equation using the quadratic formula.
x^2+11x+7=0
The solution set is { }.
(Type an exact answer, using radicals as needed. Use a comma to separate answers as needed.)
Answer by erica65404(394) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2%2B11x%2B7=0

The quadratic equation is x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
for this problem a=1, b=11, and c=7
the equation ax%5E2%2Bbx%2Bc=0 can be used to figure that out

simply plug in the values
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x+=+%28-%2811%29+%2B-+sqrt%28+%2811%29%5E2-4%2A%281%29%2A%287%29+%29%29%2F%282%2A%281%29%29+
x+=+%28-11+%2B-+sqrt%28+121-28+%29%29%2F%282%29+
x+=+%28-11+%2B-+sqrt%2893%29%29%2F%282%29+

The answer isx+=+%28-11+%2B+sqrt%2893%29%29%2F%282%29 and x+=+%28-11+-+sqrt%2893%29%29%2F%282%29

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