(4x-5)(x-5)=16x+20

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Solution for (4x-5)(x-5)=16x+20 equation:


Simplifying
(4x + -5)(x + -5) = 16x + 20

Reorder the terms:
(-5 + 4x)(x + -5) = 16x + 20

Reorder the terms:
(-5 + 4x)(-5 + x) = 16x + 20

Multiply (-5 + 4x) * (-5 + x)
(-5(-5 + x) + 4x * (-5 + x)) = 16x + 20
((-5 * -5 + x * -5) + 4x * (-5 + x)) = 16x + 20
((25 + -5x) + 4x * (-5 + x)) = 16x + 20
(25 + -5x + (-5 * 4x + x * 4x)) = 16x + 20
(25 + -5x + (-20x + 4x2)) = 16x + 20

Combine like terms: -5x + -20x = -25x
(25 + -25x + 4x2) = 16x + 20

Reorder the terms:
25 + -25x + 4x2 = 20 + 16x

Solving
25 + -25x + 4x2 = 20 + 16x

Solving for variable 'x'.

Reorder the terms:
25 + -20 + -25x + -16x + 4x2 = 20 + 16x + -20 + -16x

Combine like terms: 25 + -20 = 5
5 + -25x + -16x + 4x2 = 20 + 16x + -20 + -16x

Combine like terms: -25x + -16x = -41x
5 + -41x + 4x2 = 20 + 16x + -20 + -16x

Reorder the terms:
5 + -41x + 4x2 = 20 + -20 + 16x + -16x

Combine like terms: 20 + -20 = 0
5 + -41x + 4x2 = 0 + 16x + -16x
5 + -41x + 4x2 = 16x + -16x

Combine like terms: 16x + -16x = 0
5 + -41x + 4x2 = 0

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

Divide each side by '4'.
1.25 + -10.25x + x2 = 0

Move the constant term to the right:

Add '-1.25' to each side of the equation.
1.25 + -10.25x + -1.25 + x2 = 0 + -1.25

Reorder the terms:
1.25 + -1.25 + -10.25x + x2 = 0 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + -10.25x + x2 = 0 + -1.25
-10.25x + x2 = 0 + -1.25

Combine like terms: 0 + -1.25 = -1.25
-10.25x + x2 = -1.25

The x term is -10.25x.  Take half its coefficient (-5.125).
Square it (26.265625) and add it to both sides.

Add '26.265625' to each side of the equation.
-10.25x + 26.265625 + x2 = -1.25 + 26.265625

Reorder the terms:
26.265625 + -10.25x + x2 = -1.25 + 26.265625

Combine like terms: -1.25 + 26.265625 = 25.015625
26.265625 + -10.25x + x2 = 25.015625

Factor a perfect square on the left side:
(x + -5.125)(x + -5.125) = 25.015625

Calculate the square root of the right side: 5.001562256

Break this problem into two subproblems by setting 
(x + -5.125) equal to 5.001562256 and -5.001562256.

Subproblem 1

x + -5.125 = 5.001562256 Simplifying x + -5.125 = 5.001562256 Reorder the terms: -5.125 + x = 5.001562256 Solving -5.125 + x = 5.001562256 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.125' to each side of the equation. -5.125 + 5.125 + x = 5.001562256 + 5.125 Combine like terms: -5.125 + 5.125 = 0.000 0.000 + x = 5.001562256 + 5.125 x = 5.001562256 + 5.125 Combine like terms: 5.001562256 + 5.125 = 10.126562256 x = 10.126562256 Simplifying x = 10.126562256

Subproblem 2

x + -5.125 = -5.001562256 Simplifying x + -5.125 = -5.001562256 Reorder the terms: -5.125 + x = -5.001562256 Solving -5.125 + x = -5.001562256 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.125' to each side of the equation. -5.125 + 5.125 + x = -5.001562256 + 5.125 Combine like terms: -5.125 + 5.125 = 0.000 0.000 + x = -5.001562256 + 5.125 x = -5.001562256 + 5.125 Combine like terms: -5.001562256 + 5.125 = 0.123437744 x = 0.123437744 Simplifying x = 0.123437744

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.126562256, 0.123437744}

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