9x-2(x+6)x=-10

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Solution for 9x-2(x+6)x=-10 equation:


Simplifying
9x + -2(x + 6) * x = -10

Reorder the terms:
9x + -2(6 + x) * x = -10

Reorder the terms for easier multiplication:
9x + -2x(6 + x) = -10
9x + (6 * -2x + x * -2x) = -10
9x + (-12x + -2x2) = -10

Combine like terms: 9x + -12x = -3x
-3x + -2x2 = -10

Solving
-3x + -2x2 = -10

Solving for variable 'x'.

Reorder the terms:
10 + -3x + -2x2 = -10 + 10

Combine like terms: -10 + 10 = 0
10 + -3x + -2x2 = 0

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

Divide each side by '-2'.
-5 + 1.5x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 1.5x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 1.5x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 1.5x + x2 = 0 + 5
1.5x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
1.5x + x2 = 5

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 5 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 5 + 0.5625

Combine like terms: 5 + 0.5625 = 5.5625
0.5625 + 1.5x + x2 = 5.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 5.5625

Calculate the square root of the right side: 2.358495283

Break this problem into two subproblems by setting 
(x + 0.75) equal to 2.358495283 and -2.358495283.

Subproblem 1

x + 0.75 = 2.358495283 Simplifying x + 0.75 = 2.358495283 Reorder the terms: 0.75 + x = 2.358495283 Solving 0.75 + x = 2.358495283 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 2.358495283 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 2.358495283 + -0.75 x = 2.358495283 + -0.75 Combine like terms: 2.358495283 + -0.75 = 1.608495283 x = 1.608495283 Simplifying x = 1.608495283

Subproblem 2

x + 0.75 = -2.358495283 Simplifying x + 0.75 = -2.358495283 Reorder the terms: 0.75 + x = -2.358495283 Solving 0.75 + x = -2.358495283 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -2.358495283 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -2.358495283 + -0.75 x = -2.358495283 + -0.75 Combine like terms: -2.358495283 + -0.75 = -3.108495283 x = -3.108495283 Simplifying x = -3.108495283

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.608495283, -3.108495283}

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