6-2x(x+6)=3x+4

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Solution for 6-2x(x+6)=3x+4 equation:


Simplifying
6 + -2x(x + 6) = 3x + 4

Reorder the terms:
6 + -2x(6 + x) = 3x + 4
6 + (6 * -2x + x * -2x) = 3x + 4
6 + (-12x + -2x2) = 3x + 4

Reorder the terms:
6 + -12x + -2x2 = 4 + 3x

Solving
6 + -12x + -2x2 = 4 + 3x

Solving for variable 'x'.

Reorder the terms:
6 + -4 + -12x + -3x + -2x2 = 4 + 3x + -4 + -3x

Combine like terms: 6 + -4 = 2
2 + -12x + -3x + -2x2 = 4 + 3x + -4 + -3x

Combine like terms: -12x + -3x = -15x
2 + -15x + -2x2 = 4 + 3x + -4 + -3x

Reorder the terms:
2 + -15x + -2x2 = 4 + -4 + 3x + -3x

Combine like terms: 4 + -4 = 0
2 + -15x + -2x2 = 0 + 3x + -3x
2 + -15x + -2x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
2 + -15x + -2x2 = 0

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

Divide each side by '-2'.
-1 + 7.5x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 7.5x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 7.5x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 7.5x + x2 = 0 + 1
7.5x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
7.5x + x2 = 1

The x term is 7.5x.  Take half its coefficient (3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
7.5x + 14.0625 + x2 = 1 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = 1 + 14.0625

Combine like terms: 1 + 14.0625 = 15.0625
14.0625 + 7.5x + x2 = 15.0625

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 15.0625

Calculate the square root of the right side: 3.881043674

Break this problem into two subproblems by setting 
(x + 3.75) equal to 3.881043674 and -3.881043674.

Subproblem 1

x + 3.75 = 3.881043674 Simplifying x + 3.75 = 3.881043674 Reorder the terms: 3.75 + x = 3.881043674 Solving 3.75 + x = 3.881043674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = 3.881043674 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 3.881043674 + -3.75 x = 3.881043674 + -3.75 Combine like terms: 3.881043674 + -3.75 = 0.131043674 x = 0.131043674 Simplifying x = 0.131043674

Subproblem 2

x + 3.75 = -3.881043674 Simplifying x + 3.75 = -3.881043674 Reorder the terms: 3.75 + x = -3.881043674 Solving 3.75 + x = -3.881043674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = -3.881043674 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -3.881043674 + -3.75 x = -3.881043674 + -3.75 Combine like terms: -3.881043674 + -3.75 = -7.631043674 x = -7.631043674 Simplifying x = -7.631043674

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.131043674, -7.631043674}

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