2x(x-8)+10x=7x+39

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Solution for 2x(x-8)+10x=7x+39 equation:


Simplifying
2x(x + -8) + 10x = 7x + 39

Reorder the terms:
2x(-8 + x) + 10x = 7x + 39
(-8 * 2x + x * 2x) + 10x = 7x + 39
(-16x + 2x2) + 10x = 7x + 39

Reorder the terms:
-16x + 10x + 2x2 = 7x + 39

Combine like terms: -16x + 10x = -6x
-6x + 2x2 = 7x + 39

Reorder the terms:
-6x + 2x2 = 39 + 7x

Solving
-6x + 2x2 = 39 + 7x

Solving for variable 'x'.

Reorder the terms:
-39 + -6x + -7x + 2x2 = 39 + 7x + -39 + -7x

Combine like terms: -6x + -7x = -13x
-39 + -13x + 2x2 = 39 + 7x + -39 + -7x

Reorder the terms:
-39 + -13x + 2x2 = 39 + -39 + 7x + -7x

Combine like terms: 39 + -39 = 0
-39 + -13x + 2x2 = 0 + 7x + -7x
-39 + -13x + 2x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-39 + -13x + 2x2 = 0

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

Divide each side by '2'.
-19.5 + -6.5x + x2 = 0

Move the constant term to the right:

Add '19.5' to each side of the equation.
-19.5 + -6.5x + 19.5 + x2 = 0 + 19.5

Reorder the terms:
-19.5 + 19.5 + -6.5x + x2 = 0 + 19.5

Combine like terms: -19.5 + 19.5 = 0.0
0.0 + -6.5x + x2 = 0 + 19.5
-6.5x + x2 = 0 + 19.5

Combine like terms: 0 + 19.5 = 19.5
-6.5x + x2 = 19.5

The x term is -6.5x.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5x + 10.5625 + x2 = 19.5 + 10.5625

Reorder the terms:
10.5625 + -6.5x + x2 = 19.5 + 10.5625

Combine like terms: 19.5 + 10.5625 = 30.0625
10.5625 + -6.5x + x2 = 30.0625

Factor a perfect square on the left side:
(x + -3.25)(x + -3.25) = 30.0625

Calculate the square root of the right side: 5.48292805

Break this problem into two subproblems by setting 
(x + -3.25) equal to 5.48292805 and -5.48292805.

Subproblem 1

x + -3.25 = 5.48292805 Simplifying x + -3.25 = 5.48292805 Reorder the terms: -3.25 + x = 5.48292805 Solving -3.25 + x = 5.48292805 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = 5.48292805 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = 5.48292805 + 3.25 x = 5.48292805 + 3.25 Combine like terms: 5.48292805 + 3.25 = 8.73292805 x = 8.73292805 Simplifying x = 8.73292805

Subproblem 2

x + -3.25 = -5.48292805 Simplifying x + -3.25 = -5.48292805 Reorder the terms: -3.25 + x = -5.48292805 Solving -3.25 + x = -5.48292805 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = -5.48292805 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = -5.48292805 + 3.25 x = -5.48292805 + 3.25 Combine like terms: -5.48292805 + 3.25 = -2.23292805 x = -2.23292805 Simplifying x = -2.23292805

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.73292805, -2.23292805}

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