(x-3)-2x(x+6)=-5

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Solution for (x-3)-2x(x+6)=-5 equation:


Simplifying
(x + -3) + -2x(x + 6) = -5

Reorder the terms:
(-3 + x) + -2x(x + 6) = -5

Remove parenthesis around (-3 + x)
-3 + x + -2x(x + 6) = -5

Reorder the terms:
-3 + x + -2x(6 + x) = -5
-3 + x + (6 * -2x + x * -2x) = -5
-3 + x + (-12x + -2x2) = -5

Combine like terms: x + -12x = -11x
-3 + -11x + -2x2 = -5

Solving
-3 + -11x + -2x2 = -5

Solving for variable 'x'.

Reorder the terms:
-3 + 5 + -11x + -2x2 = -5 + 5

Combine like terms: -3 + 5 = 2
2 + -11x + -2x2 = -5 + 5

Combine like terms: -5 + 5 = 0
2 + -11x + -2x2 = 0

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

Divide each side by '-2'.
-1 + 5.5x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 5.5x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 5.5x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 5.5x + x2 = 0 + 1
5.5x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
5.5x + x2 = 1

The x term is 5.5x.  Take half its coefficient (2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
5.5x + 7.5625 + x2 = 1 + 7.5625

Reorder the terms:
7.5625 + 5.5x + x2 = 1 + 7.5625

Combine like terms: 1 + 7.5625 = 8.5625
7.5625 + 5.5x + x2 = 8.5625

Factor a perfect square on the left side:
(x + 2.75)(x + 2.75) = 8.5625

Calculate the square root of the right side: 2.926174978

Break this problem into two subproblems by setting 
(x + 2.75) equal to 2.926174978 and -2.926174978.

Subproblem 1

x + 2.75 = 2.926174978 Simplifying x + 2.75 = 2.926174978 Reorder the terms: 2.75 + x = 2.926174978 Solving 2.75 + x = 2.926174978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = 2.926174978 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = 2.926174978 + -2.75 x = 2.926174978 + -2.75 Combine like terms: 2.926174978 + -2.75 = 0.176174978 x = 0.176174978 Simplifying x = 0.176174978

Subproblem 2

x + 2.75 = -2.926174978 Simplifying x + 2.75 = -2.926174978 Reorder the terms: 2.75 + x = -2.926174978 Solving 2.75 + x = -2.926174978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = -2.926174978 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = -2.926174978 + -2.75 x = -2.926174978 + -2.75 Combine like terms: -2.926174978 + -2.75 = -5.676174978 x = -5.676174978 Simplifying x = -5.676174978

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.176174978, -5.676174978}

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