5x^2-6x-36=0

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Solution for 5x^2-6x-36=0 equation:


Simplifying
5x2 + -6x + -36 = 0

Reorder the terms:
-36 + -6x + 5x2 = 0

Solving
-36 + -6x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-7.2 + -1.2x + x2 = 0

Move the constant term to the right:

Add '7.2' to each side of the equation.
-7.2 + -1.2x + 7.2 + x2 = 0 + 7.2

Reorder the terms:
-7.2 + 7.2 + -1.2x + x2 = 0 + 7.2

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + -1.2x + x2 = 0 + 7.2
-1.2x + x2 = 0 + 7.2

Combine like terms: 0 + 7.2 = 7.2
-1.2x + x2 = 7.2

The x term is -1.2x.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2x + 0.36 + x2 = 7.2 + 0.36

Reorder the terms:
0.36 + -1.2x + x2 = 7.2 + 0.36

Combine like terms: 7.2 + 0.36 = 7.56
0.36 + -1.2x + x2 = 7.56

Factor a perfect square on the left side:
(x + -0.6)(x + -0.6) = 7.56

Calculate the square root of the right side: 2.749545417

Break this problem into two subproblems by setting 
(x + -0.6) equal to 2.749545417 and -2.749545417.

Subproblem 1

x + -0.6 = 2.749545417 Simplifying x + -0.6 = 2.749545417 Reorder the terms: -0.6 + x = 2.749545417 Solving -0.6 + x = 2.749545417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = 2.749545417 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = 2.749545417 + 0.6 x = 2.749545417 + 0.6 Combine like terms: 2.749545417 + 0.6 = 3.349545417 x = 3.349545417 Simplifying x = 3.349545417

Subproblem 2

x + -0.6 = -2.749545417 Simplifying x + -0.6 = -2.749545417 Reorder the terms: -0.6 + x = -2.749545417 Solving -0.6 + x = -2.749545417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = -2.749545417 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = -2.749545417 + 0.6 x = -2.749545417 + 0.6 Combine like terms: -2.749545417 + 0.6 = -2.149545417 x = -2.149545417 Simplifying x = -2.149545417

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.349545417, -2.149545417}

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