SOLUTION: Hello, I soloved this quadratic equation and came up with a negative answer which I think is right. Would you please check it. 16x^2-40x=-25 16x^2-40x+25=0 -40+-sqrt(40)^2-4(

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Hello, I soloved this quadratic equation and came up with a negative answer which I think is right. Would you please check it. 16x^2-40x=-25 16x^2-40x+25=0 -40+-sqrt(40)^2-4(      Log On


   

Question 411667: Hello, I soloved this quadratic equation and came up with a negative answer which I think is right. Would you please check it.
16x^2-40x=-25
16x^2-40x+25=0
-40+-sqrt(40)^2-4(16)(25)/(2(16))
-40+-sqrt(1600-1600)/(32)
-40+-sqrt(0)/(32)
x = -(4)/(5)

Found 2 solutions by emargo19, sudhanshu_kmr:
Answer by emargo19(101) About Me  (Show Source):
You can put this solution on YOUR website!
16x%5E2-40x=-25
16x%5E2-40x%2B25=0
Using the Quadratic Equation=
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x+=+%28-%28-40%29+%2B-+sqrt%28+%28-40%29%5E2-+%284%29%2816%29%2825%29+%29%29%2F%282%2A16%29
x+=+%2840+%2B-+sqrt%281600-+1600%29%29%2F%2832%29
x+=+%2840+%2B-+sqrt%280%29%29%2F%2832%29
x+=+%2840+%2B-+0%29%2F%2832%29
x+=+%2840-0%29%2F32+ or %2840%2B0%29%2F32
x+=+40%2F32 or 40%2F32
x+=+%285%29%2F%284%29 or %285%29%2F%284%29






Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

formula is -b +- sqrt(b^2 -4ac)/2a
so, 40/32 not -40/32
40/32
= 5/4