2x(4x-5)=5

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


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

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

Solving
-10x + 8x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + -10x + 8x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -10x + 8x2 = 0

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

Divide each side by '8'.
-0.625 + -1.25x + x2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + -1.25x + 0.625 + x2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + -1.25x + x2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + -1.25x + x2 = 0 + 0.625
-1.25x + x2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
-1.25x + x2 = 0.625

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 = 0.625 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 0.625 + 0.390625

Combine like terms: 0.625 + 0.390625 = 1.015625
0.390625 + -1.25x + x2 = 1.015625

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 1.015625

Calculate the square root of the right side: 1.007782219

Break this problem into two subproblems by setting 
(x + -0.625) equal to 1.007782219 and -1.007782219.

Subproblem 1

x + -0.625 = 1.007782219 Simplifying x + -0.625 = 1.007782219 Reorder the terms: -0.625 + x = 1.007782219 Solving -0.625 + x = 1.007782219 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 = 1.007782219 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 1.007782219 + 0.625 x = 1.007782219 + 0.625 Combine like terms: 1.007782219 + 0.625 = 1.632782219 x = 1.632782219 Simplifying x = 1.632782219

Subproblem 2

x + -0.625 = -1.007782219 Simplifying x + -0.625 = -1.007782219 Reorder the terms: -0.625 + x = -1.007782219 Solving -0.625 + x = -1.007782219 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 = -1.007782219 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -1.007782219 + 0.625 x = -1.007782219 + 0.625 Combine like terms: -1.007782219 + 0.625 = -0.382782219 x = -0.382782219 Simplifying x = -0.382782219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.632782219, -0.382782219}

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