SOLUTION: I am lost on a quadratic equation when I get to the part where -8+,- (square root of)704 (over)4. The problem is A=2, B=8, C=-80

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons -> SOLUTION: I am lost on a quadratic equation when I get to the part where -8+,- (square root of)704 (over)4. The problem is A=2, B=8, C=-80      Log On


   

Question 436892: I am lost on a quadratic equation when I get to the part where -8+,- (square root of)704 (over)4. The problem is A=2, B=8, C=-80
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

The problem is A=2, B=8, C=-80
2x%5E2+%2B+8x+-80=0.....use quadratic formula
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ .....plug in A=2, B=8, C=-80
x+=+%28-8+%2B-+sqrt%28+8%5E2-4%2A2%2A%28-80%29+%29%29%2F%282%2A2%29+
x+=+%28-8+%2B-+sqrt%28+64%2B640+%29%29%2F4
x+=+%28-8+%2B-+sqrt%28+704%29%29%2F4
x+=+%28-8+%2B-+26.53%29%2F4
roots:
x+=+%28-8+%2B26.53%29%2F4
x+=+18.53%2F4
x+=+4.6325
or
x+=+%28-8+-26.53%29%2F4
x+=+%28-34.53%29%2F4
x+=+-8.6325