2x(4x-5)=-1

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Solution for 2x(4x-5)=-1 equation:


Simplifying
2x(4x + -5) = -1

Reorder the terms:
2x(-5 + 4x) = -1
(-5 * 2x + 4x * 2x) = -1
(-10x + 8x2) = -1

Solving
-10x + 8x2 = -1

Solving for variable 'x'.

Reorder the terms:
1 + -10x + 8x2 = -1 + 1

Combine like terms: -1 + 1 = 0
1 + -10x + 8x2 = 0

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

Divide each side by '8'.
0.125 + -1.25x + x2 = 0

Move the constant term to the right:

Add '-0.125' to each side of the equation.
0.125 + -1.25x + -0.125 + x2 = 0 + -0.125

Reorder the terms:
0.125 + -0.125 + -1.25x + x2 = 0 + -0.125

Combine like terms: 0.125 + -0.125 = 0.000
0.000 + -1.25x + x2 = 0 + -0.125
-1.25x + x2 = 0 + -0.125

Combine like terms: 0 + -0.125 = -0.125
-1.25x + x2 = -0.125

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = -0.125 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = -0.125 + 0.390625

Combine like terms: -0.125 + 0.390625 = 0.265625
0.390625 + -1.25x + x2 = 0.265625

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 0.265625

Calculate the square root of the right side: 0.515388203

Break this problem into two subproblems by setting 
(x + -0.625) equal to 0.515388203 and -0.515388203.

Subproblem 1

x + -0.625 = 0.515388203 Simplifying x + -0.625 = 0.515388203 Reorder the terms: -0.625 + x = 0.515388203 Solving -0.625 + x = 0.515388203 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 0.515388203 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 0.515388203 + 0.625 x = 0.515388203 + 0.625 Combine like terms: 0.515388203 + 0.625 = 1.140388203 x = 1.140388203 Simplifying x = 1.140388203

Subproblem 2

x + -0.625 = -0.515388203 Simplifying x + -0.625 = -0.515388203 Reorder the terms: -0.625 + x = -0.515388203 Solving -0.625 + x = -0.515388203 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -0.515388203 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -0.515388203 + 0.625 x = -0.515388203 + 0.625 Combine like terms: -0.515388203 + 0.625 = 0.109611797 x = 0.109611797 Simplifying x = 0.109611797

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.140388203, 0.109611797}

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