-16x^2+85x+5=0

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Solution for -16x^2+85x+5=0 equation:


Simplifying
-16x2 + 85x + 5 = 0

Reorder the terms:
5 + 85x + -16x2 = 0

Solving
5 + 85x + -16x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-0.3125 + -5.3125x + x2 = 0

Move the constant term to the right:

Add '0.3125' to each side of the equation.
-0.3125 + -5.3125x + 0.3125 + x2 = 0 + 0.3125

Reorder the terms:
-0.3125 + 0.3125 + -5.3125x + x2 = 0 + 0.3125

Combine like terms: -0.3125 + 0.3125 = 0.0000
0.0000 + -5.3125x + x2 = 0 + 0.3125
-5.3125x + x2 = 0 + 0.3125

Combine like terms: 0 + 0.3125 = 0.3125
-5.3125x + x2 = 0.3125

The x term is -5.3125x.  Take half its coefficient (-2.65625).
Square it (7.055664063) and add it to both sides.

Add '7.055664063' to each side of the equation.
-5.3125x + 7.055664063 + x2 = 0.3125 + 7.055664063

Reorder the terms:
7.055664063 + -5.3125x + x2 = 0.3125 + 7.055664063

Combine like terms: 0.3125 + 7.055664063 = 7.368164063
7.055664063 + -5.3125x + x2 = 7.368164063

Factor a perfect square on the left side:
(x + -2.65625)(x + -2.65625) = 7.368164063

Calculate the square root of the right side: 2.714436233

Break this problem into two subproblems by setting 
(x + -2.65625) equal to 2.714436233 and -2.714436233.

Subproblem 1

x + -2.65625 = 2.714436233 Simplifying x + -2.65625 = 2.714436233 Reorder the terms: -2.65625 + x = 2.714436233 Solving -2.65625 + x = 2.714436233 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.65625' to each side of the equation. -2.65625 + 2.65625 + x = 2.714436233 + 2.65625 Combine like terms: -2.65625 + 2.65625 = 0.00000 0.00000 + x = 2.714436233 + 2.65625 x = 2.714436233 + 2.65625 Combine like terms: 2.714436233 + 2.65625 = 5.370686233 x = 5.370686233 Simplifying x = 5.370686233

Subproblem 2

x + -2.65625 = -2.714436233 Simplifying x + -2.65625 = -2.714436233 Reorder the terms: -2.65625 + x = -2.714436233 Solving -2.65625 + x = -2.714436233 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.65625' to each side of the equation. -2.65625 + 2.65625 + x = -2.714436233 + 2.65625 Combine like terms: -2.65625 + 2.65625 = 0.00000 0.00000 + x = -2.714436233 + 2.65625 x = -2.714436233 + 2.65625 Combine like terms: -2.714436233 + 2.65625 = -0.058186233 x = -0.058186233 Simplifying x = -0.058186233

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.370686233, -0.058186233}

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