10x(2x-4)+5=2x-8

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Solution for 10x(2x-4)+5=2x-8 equation:


Simplifying
10x(2x + -4) + 5 = 2x + -8

Reorder the terms:
10x(-4 + 2x) + 5 = 2x + -8
(-4 * 10x + 2x * 10x) + 5 = 2x + -8
(-40x + 20x2) + 5 = 2x + -8

Reorder the terms:
5 + -40x + 20x2 = 2x + -8

Reorder the terms:
5 + -40x + 20x2 = -8 + 2x

Solving
5 + -40x + 20x2 = -8 + 2x

Solving for variable 'x'.

Reorder the terms:
5 + 8 + -40x + -2x + 20x2 = -8 + 2x + 8 + -2x

Combine like terms: 5 + 8 = 13
13 + -40x + -2x + 20x2 = -8 + 2x + 8 + -2x

Combine like terms: -40x + -2x = -42x
13 + -42x + 20x2 = -8 + 2x + 8 + -2x

Reorder the terms:
13 + -42x + 20x2 = -8 + 8 + 2x + -2x

Combine like terms: -8 + 8 = 0
13 + -42x + 20x2 = 0 + 2x + -2x
13 + -42x + 20x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
13 + -42x + 20x2 = 0

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

Divide each side by '20'.
0.65 + -2.1x + x2 = 0.0

Move the constant term to the right:

Add '-0.65' to each side of the equation.
0.65 + -2.1x + -0.65 + x2 = 0.0 + -0.65

Reorder the terms:
0.65 + -0.65 + -2.1x + x2 = 0.0 + -0.65

Combine like terms: 0.65 + -0.65 = 0.00
0.00 + -2.1x + x2 = 0.0 + -0.65
-2.1x + x2 = 0.0 + -0.65

Combine like terms: 0.0 + -0.65 = -0.65
-2.1x + x2 = -0.65

The x term is -2.1x.  Take half its coefficient (-1.05).
Square it (1.1025) and add it to both sides.

Add '1.1025' to each side of the equation.
-2.1x + 1.1025 + x2 = -0.65 + 1.1025

Reorder the terms:
1.1025 + -2.1x + x2 = -0.65 + 1.1025

Combine like terms: -0.65 + 1.1025 = 0.4525
1.1025 + -2.1x + x2 = 0.4525

Factor a perfect square on the left side:
(x + -1.05)(x + -1.05) = 0.4525

Calculate the square root of the right side: 0.672681202

Break this problem into two subproblems by setting 
(x + -1.05) equal to 0.672681202 and -0.672681202.

Subproblem 1

x + -1.05 = 0.672681202 Simplifying x + -1.05 = 0.672681202 Reorder the terms: -1.05 + x = 0.672681202 Solving -1.05 + x = 0.672681202 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.05' to each side of the equation. -1.05 + 1.05 + x = 0.672681202 + 1.05 Combine like terms: -1.05 + 1.05 = 0.00 0.00 + x = 0.672681202 + 1.05 x = 0.672681202 + 1.05 Combine like terms: 0.672681202 + 1.05 = 1.722681202 x = 1.722681202 Simplifying x = 1.722681202

Subproblem 2

x + -1.05 = -0.672681202 Simplifying x + -1.05 = -0.672681202 Reorder the terms: -1.05 + x = -0.672681202 Solving -1.05 + x = -0.672681202 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.05' to each side of the equation. -1.05 + 1.05 + x = -0.672681202 + 1.05 Combine like terms: -1.05 + 1.05 = 0.00 0.00 + x = -0.672681202 + 1.05 x = -0.672681202 + 1.05 Combine like terms: -0.672681202 + 1.05 = 0.377318798 x = 0.377318798 Simplifying x = 0.377318798

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.722681202, 0.377318798}

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