(x-5)(4x-10)=x

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Solution for (x-5)(4x-10)=x equation:


Simplifying
(x + -5)(4x + -10) = x

Reorder the terms:
(-5 + x)(4x + -10) = x

Reorder the terms:
(-5 + x)(-10 + 4x) = x

Multiply (-5 + x) * (-10 + 4x)
(-5(-10 + 4x) + x(-10 + 4x)) = x
((-10 * -5 + 4x * -5) + x(-10 + 4x)) = x
((50 + -20x) + x(-10 + 4x)) = x
(50 + -20x + (-10 * x + 4x * x)) = x
(50 + -20x + (-10x + 4x2)) = x

Combine like terms: -20x + -10x = -30x
(50 + -30x + 4x2) = x

Solving
50 + -30x + 4x2 = x

Solving for variable 'x'.

Reorder the terms:
50 + -30x + -1x + 4x2 = x + -1x

Combine like terms: -30x + -1x = -31x
50 + -31x + 4x2 = x + -1x

Combine like terms: x + -1x = 0
50 + -31x + 4x2 = 0

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

Divide each side by '4'.
12.5 + -7.75x + x2 = 0

Move the constant term to the right:

Add '-12.5' to each side of the equation.
12.5 + -7.75x + -12.5 + x2 = 0 + -12.5

Reorder the terms:
12.5 + -12.5 + -7.75x + x2 = 0 + -12.5

Combine like terms: 12.5 + -12.5 = 0.0
0.0 + -7.75x + x2 = 0 + -12.5
-7.75x + x2 = 0 + -12.5

Combine like terms: 0 + -12.5 = -12.5
-7.75x + x2 = -12.5

The x term is -7.75x.  Take half its coefficient (-3.875).
Square it (15.015625) and add it to both sides.

Add '15.015625' to each side of the equation.
-7.75x + 15.015625 + x2 = -12.5 + 15.015625

Reorder the terms:
15.015625 + -7.75x + x2 = -12.5 + 15.015625

Combine like terms: -12.5 + 15.015625 = 2.515625
15.015625 + -7.75x + x2 = 2.515625

Factor a perfect square on the left side:
(x + -3.875)(x + -3.875) = 2.515625

Calculate the square root of the right side: 1.586072193

Break this problem into two subproblems by setting 
(x + -3.875) equal to 1.586072193 and -1.586072193.

Subproblem 1

x + -3.875 = 1.586072193 Simplifying x + -3.875 = 1.586072193 Reorder the terms: -3.875 + x = 1.586072193 Solving -3.875 + x = 1.586072193 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.875' to each side of the equation. -3.875 + 3.875 + x = 1.586072193 + 3.875 Combine like terms: -3.875 + 3.875 = 0.000 0.000 + x = 1.586072193 + 3.875 x = 1.586072193 + 3.875 Combine like terms: 1.586072193 + 3.875 = 5.461072193 x = 5.461072193 Simplifying x = 5.461072193

Subproblem 2

x + -3.875 = -1.586072193 Simplifying x + -3.875 = -1.586072193 Reorder the terms: -3.875 + x = -1.586072193 Solving -3.875 + x = -1.586072193 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.875' to each side of the equation. -3.875 + 3.875 + x = -1.586072193 + 3.875 Combine like terms: -3.875 + 3.875 = 0.000 0.000 + x = -1.586072193 + 3.875 x = -1.586072193 + 3.875 Combine like terms: -1.586072193 + 3.875 = 2.288927807 x = 2.288927807 Simplifying x = 2.288927807

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.461072193, 2.288927807}

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