(x-5)(4x-5)=40

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Solution for (x-5)(4x-5)=40 equation:


Simplifying
(x + -5)(4x + -5) = 40

Reorder the terms:
(-5 + x)(4x + -5) = 40

Reorder the terms:
(-5 + x)(-5 + 4x) = 40

Multiply (-5 + x) * (-5 + 4x)
(-5(-5 + 4x) + x(-5 + 4x)) = 40
((-5 * -5 + 4x * -5) + x(-5 + 4x)) = 40
((25 + -20x) + x(-5 + 4x)) = 40
(25 + -20x + (-5 * x + 4x * x)) = 40
(25 + -20x + (-5x + 4x2)) = 40

Combine like terms: -20x + -5x = -25x
(25 + -25x + 4x2) = 40

Solving
25 + -25x + 4x2 = 40

Solving for variable 'x'.

Reorder the terms:
25 + -40 + -25x + 4x2 = 40 + -40

Combine like terms: 25 + -40 = -15
-15 + -25x + 4x2 = 40 + -40

Combine like terms: 40 + -40 = 0
-15 + -25x + 4x2 = 0

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

Divide each side by '4'.
-3.75 + -6.25x + x2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -6.25x + 3.75 + x2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -6.25x + x2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -6.25x + x2 = 0 + 3.75
-6.25x + x2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-6.25x + x2 = 3.75

The x term is -6.25x.  Take half its coefficient (-3.125).
Square it (9.765625) and add it to both sides.

Add '9.765625' to each side of the equation.
-6.25x + 9.765625 + x2 = 3.75 + 9.765625

Reorder the terms:
9.765625 + -6.25x + x2 = 3.75 + 9.765625

Combine like terms: 3.75 + 9.765625 = 13.515625
9.765625 + -6.25x + x2 = 13.515625

Factor a perfect square on the left side:
(x + -3.125)(x + -3.125) = 13.515625

Calculate the square root of the right side: 3.676360292

Break this problem into two subproblems by setting 
(x + -3.125) equal to 3.676360292 and -3.676360292.

Subproblem 1

x + -3.125 = 3.676360292 Simplifying x + -3.125 = 3.676360292 Reorder the terms: -3.125 + x = 3.676360292 Solving -3.125 + x = 3.676360292 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + x = 3.676360292 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + x = 3.676360292 + 3.125 x = 3.676360292 + 3.125 Combine like terms: 3.676360292 + 3.125 = 6.801360292 x = 6.801360292 Simplifying x = 6.801360292

Subproblem 2

x + -3.125 = -3.676360292 Simplifying x + -3.125 = -3.676360292 Reorder the terms: -3.125 + x = -3.676360292 Solving -3.125 + x = -3.676360292 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + x = -3.676360292 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + x = -3.676360292 + 3.125 x = -3.676360292 + 3.125 Combine like terms: -3.676360292 + 3.125 = -0.551360292 x = -0.551360292 Simplifying x = -0.551360292

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.801360292, -0.551360292}

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