-16x^2-5x+500=0

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Solution for -16x^2-5x+500=0 equation:


Simplifying
-16x2 + -5x + 500 = 0

Reorder the terms:
500 + -5x + -16x2 = 0

Solving
500 + -5x + -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'.
-31.25 + 0.3125x + x2 = 0

Move the constant term to the right:

Add '31.25' to each side of the equation.
-31.25 + 0.3125x + 31.25 + x2 = 0 + 31.25

Reorder the terms:
-31.25 + 31.25 + 0.3125x + x2 = 0 + 31.25

Combine like terms: -31.25 + 31.25 = 0.00
0.00 + 0.3125x + x2 = 0 + 31.25
0.3125x + x2 = 0 + 31.25

Combine like terms: 0 + 31.25 = 31.25
0.3125x + x2 = 31.25

The x term is 0.3125x.  Take half its coefficient (0.15625).
Square it (0.0244140625) and add it to both sides.

Add '0.0244140625' to each side of the equation.
0.3125x + 0.0244140625 + x2 = 31.25 + 0.0244140625

Reorder the terms:
0.0244140625 + 0.3125x + x2 = 31.25 + 0.0244140625

Combine like terms: 31.25 + 0.0244140625 = 31.2744140625
0.0244140625 + 0.3125x + x2 = 31.2744140625

Factor a perfect square on the left side:
(x + 0.15625)(x + 0.15625) = 31.2744140625

Calculate the square root of the right side: 5.592353178

Break this problem into two subproblems by setting 
(x + 0.15625) equal to 5.592353178 and -5.592353178.

Subproblem 1

x + 0.15625 = 5.592353178 Simplifying x + 0.15625 = 5.592353178 Reorder the terms: 0.15625 + x = 5.592353178 Solving 0.15625 + x = 5.592353178 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15625' to each side of the equation. 0.15625 + -0.15625 + x = 5.592353178 + -0.15625 Combine like terms: 0.15625 + -0.15625 = 0.00000 0.00000 + x = 5.592353178 + -0.15625 x = 5.592353178 + -0.15625 Combine like terms: 5.592353178 + -0.15625 = 5.436103178 x = 5.436103178 Simplifying x = 5.436103178

Subproblem 2

x + 0.15625 = -5.592353178 Simplifying x + 0.15625 = -5.592353178 Reorder the terms: 0.15625 + x = -5.592353178 Solving 0.15625 + x = -5.592353178 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15625' to each side of the equation. 0.15625 + -0.15625 + x = -5.592353178 + -0.15625 Combine like terms: 0.15625 + -0.15625 = 0.00000 0.00000 + x = -5.592353178 + -0.15625 x = -5.592353178 + -0.15625 Combine like terms: -5.592353178 + -0.15625 = -5.748603178 x = -5.748603178 Simplifying x = -5.748603178

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.436103178, -5.748603178}

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