10x^2-20x-8=5x^2-6x

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Solution for 10x^2-20x-8=5x^2-6x equation:


Simplifying
10x2 + -20x + -8 = 5x2 + -6x

Reorder the terms:
-8 + -20x + 10x2 = 5x2 + -6x

Reorder the terms:
-8 + -20x + 10x2 = -6x + 5x2

Solving
-8 + -20x + 10x2 = -6x + 5x2

Solving for variable 'x'.

Reorder the terms:
-8 + -20x + 6x + 10x2 + -5x2 = -6x + 5x2 + 6x + -5x2

Combine like terms: -20x + 6x = -14x
-8 + -14x + 10x2 + -5x2 = -6x + 5x2 + 6x + -5x2

Combine like terms: 10x2 + -5x2 = 5x2
-8 + -14x + 5x2 = -6x + 5x2 + 6x + -5x2

Reorder the terms:
-8 + -14x + 5x2 = -6x + 6x + 5x2 + -5x2

Combine like terms: -6x + 6x = 0
-8 + -14x + 5x2 = 0 + 5x2 + -5x2
-8 + -14x + 5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
-8 + -14x + 5x2 = 0

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

Divide each side by '5'.
-1.6 + -2.8x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -2.8x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -2.8x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -2.8x + x2 = 0 + 1.6
-2.8x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-2.8x + x2 = 1.6

The x term is -2.8x.  Take half its coefficient (-1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
-2.8x + 1.96 + x2 = 1.6 + 1.96

Reorder the terms:
1.96 + -2.8x + x2 = 1.6 + 1.96

Combine like terms: 1.6 + 1.96 = 3.56
1.96 + -2.8x + x2 = 3.56

Factor a perfect square on the left side:
(x + -1.4)(x + -1.4) = 3.56

Calculate the square root of the right side: 1.886796226

Break this problem into two subproblems by setting 
(x + -1.4) equal to 1.886796226 and -1.886796226.

Subproblem 1

x + -1.4 = 1.886796226 Simplifying x + -1.4 = 1.886796226 Reorder the terms: -1.4 + x = 1.886796226 Solving -1.4 + x = 1.886796226 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = 1.886796226 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = 1.886796226 + 1.4 x = 1.886796226 + 1.4 Combine like terms: 1.886796226 + 1.4 = 3.286796226 x = 3.286796226 Simplifying x = 3.286796226

Subproblem 2

x + -1.4 = -1.886796226 Simplifying x + -1.4 = -1.886796226 Reorder the terms: -1.4 + x = -1.886796226 Solving -1.4 + x = -1.886796226 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = -1.886796226 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = -1.886796226 + 1.4 x = -1.886796226 + 1.4 Combine like terms: -1.886796226 + 1.4 = -0.486796226 x = -0.486796226 Simplifying x = -0.486796226

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.286796226, -0.486796226}

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