SOLUTION: y=-x^2+20x-4

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Question 470590: y=-x^2+20x-4
Found 2 solutions by sofiyac, Alan3354:
Answer by sofiyac(983) About Me  (Show Source):
You can put this solution on YOUR website!
a=-1
b=20
c=-4
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x+=+%28-20+%2B-+sqrt%28+400-16+%29%29%2F%28-2%29+
x+=+%28-20+%2B-+sqrt%28+384+%29%29%2F%28-2%29+
x+=+%28-20+%2B-+8sqrt%28+6+%29%29%2F%28-2%29+
x+=+-2%28-10+%2B-+4sqrt%28+6+%29%29%2F%28-2%29+
x+=+-10+%2B-+4sqrt%28+6+%29+

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
It's +10 ± ... as the other tutor had.