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

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


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

Reorder the terms:
(-5 + x)(4x + 5) = 2

Reorder the terms:
(-5 + x)(5 + 4x) = 2

Multiply (-5 + x) * (5 + 4x)
(-5(5 + 4x) + x(5 + 4x)) = 2
((5 * -5 + 4x * -5) + x(5 + 4x)) = 2
((-25 + -20x) + x(5 + 4x)) = 2
(-25 + -20x + (5 * x + 4x * x)) = 2
(-25 + -20x + (5x + 4x2)) = 2

Combine like terms: -20x + 5x = -15x
(-25 + -15x + 4x2) = 2

Solving
-25 + -15x + 4x2 = 2

Solving for variable 'x'.

Reorder the terms:
-25 + -2 + -15x + 4x2 = 2 + -2

Combine like terms: -25 + -2 = -27
-27 + -15x + 4x2 = 2 + -2

Combine like terms: 2 + -2 = 0
-27 + -15x + 4x2 = 0

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

Divide each side by '4'.
-6.75 + -3.75x + x2 = 0

Move the constant term to the right:

Add '6.75' to each side of the equation.
-6.75 + -3.75x + 6.75 + x2 = 0 + 6.75

Reorder the terms:
-6.75 + 6.75 + -3.75x + x2 = 0 + 6.75

Combine like terms: -6.75 + 6.75 = 0.00
0.00 + -3.75x + x2 = 0 + 6.75
-3.75x + x2 = 0 + 6.75

Combine like terms: 0 + 6.75 = 6.75
-3.75x + x2 = 6.75

The x term is -3.75x.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75x + 3.515625 + x2 = 6.75 + 3.515625

Reorder the terms:
3.515625 + -3.75x + x2 = 6.75 + 3.515625

Combine like terms: 6.75 + 3.515625 = 10.265625
3.515625 + -3.75x + x2 = 10.265625

Factor a perfect square on the left side:
(x + -1.875)(x + -1.875) = 10.265625

Calculate the square root of the right side: 3.204001404

Break this problem into two subproblems by setting 
(x + -1.875) equal to 3.204001404 and -3.204001404.

Subproblem 1

x + -1.875 = 3.204001404 Simplifying x + -1.875 = 3.204001404 Reorder the terms: -1.875 + x = 3.204001404 Solving -1.875 + x = 3.204001404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = 3.204001404 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 3.204001404 + 1.875 x = 3.204001404 + 1.875 Combine like terms: 3.204001404 + 1.875 = 5.079001404 x = 5.079001404 Simplifying x = 5.079001404

Subproblem 2

x + -1.875 = -3.204001404 Simplifying x + -1.875 = -3.204001404 Reorder the terms: -1.875 + x = -3.204001404 Solving -1.875 + x = -3.204001404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = -3.204001404 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -3.204001404 + 1.875 x = -3.204001404 + 1.875 Combine like terms: -3.204001404 + 1.875 = -1.329001404 x = -1.329001404 Simplifying x = -1.329001404

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.079001404, -1.329001404}

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