-4(x^2-6x-36)=39

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Solution for -4(x^2-6x-36)=39 equation:


Simplifying
-4(x2 + -6x + -36) = 39

Reorder the terms:
-4(-36 + -6x + x2) = 39
(-36 * -4 + -6x * -4 + x2 * -4) = 39
(144 + 24x + -4x2) = 39

Solving
144 + 24x + -4x2 = 39

Solving for variable 'x'.

Reorder the terms:
144 + -39 + 24x + -4x2 = 39 + -39

Combine like terms: 144 + -39 = 105
105 + 24x + -4x2 = 39 + -39

Combine like terms: 39 + -39 = 0
105 + 24x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-26.25 + -6x + x2 = 0

Move the constant term to the right:

Add '26.25' to each side of the equation.
-26.25 + -6x + 26.25 + x2 = 0 + 26.25

Reorder the terms:
-26.25 + 26.25 + -6x + x2 = 0 + 26.25

Combine like terms: -26.25 + 26.25 = 0.00
0.00 + -6x + x2 = 0 + 26.25
-6x + x2 = 0 + 26.25

Combine like terms: 0 + 26.25 = 26.25
-6x + x2 = 26.25

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 26.25 + 9

Reorder the terms:
9 + -6x + x2 = 26.25 + 9

Combine like terms: 26.25 + 9 = 35.25
9 + -6x + x2 = 35.25

Factor a perfect square on the left side:
(x + -3)(x + -3) = 35.25

Calculate the square root of the right side: 5.937171044

Break this problem into two subproblems by setting 
(x + -3) equal to 5.937171044 and -5.937171044.

Subproblem 1

x + -3 = 5.937171044 Simplifying x + -3 = 5.937171044 Reorder the terms: -3 + x = 5.937171044 Solving -3 + x = 5.937171044 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 5.937171044 + 3 Combine like terms: -3 + 3 = 0 0 + x = 5.937171044 + 3 x = 5.937171044 + 3 Combine like terms: 5.937171044 + 3 = 8.937171044 x = 8.937171044 Simplifying x = 8.937171044

Subproblem 2

x + -3 = -5.937171044 Simplifying x + -3 = -5.937171044 Reorder the terms: -3 + x = -5.937171044 Solving -3 + x = -5.937171044 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -5.937171044 + 3 Combine like terms: -3 + 3 = 0 0 + x = -5.937171044 + 3 x = -5.937171044 + 3 Combine like terms: -5.937171044 + 3 = -2.937171044 x = -2.937171044 Simplifying x = -2.937171044

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.937171044, -2.937171044}

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