5x^2+36x-5=0

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


Simplifying
5x2 + 36x + -5 = 0

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

Solving
-5 + 36x + 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'.
-1 + 7.2x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 7.2x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 7.2x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 7.2x + x2 = 0 + 1
7.2x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
7.2x + x2 = 1

The x term is 7.2x.  Take half its coefficient (3.6).
Square it (12.96) and add it to both sides.

Add '12.96' to each side of the equation.
7.2x + 12.96 + x2 = 1 + 12.96

Reorder the terms:
12.96 + 7.2x + x2 = 1 + 12.96

Combine like terms: 1 + 12.96 = 13.96
12.96 + 7.2x + x2 = 13.96

Factor a perfect square on the left side:
(x + 3.6)(x + 3.6) = 13.96

Calculate the square root of the right side: 3.736308338

Break this problem into two subproblems by setting 
(x + 3.6) equal to 3.736308338 and -3.736308338.

Subproblem 1

x + 3.6 = 3.736308338 Simplifying x + 3.6 = 3.736308338 Reorder the terms: 3.6 + x = 3.736308338 Solving 3.6 + x = 3.736308338 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.6' to each side of the equation. 3.6 + -3.6 + x = 3.736308338 + -3.6 Combine like terms: 3.6 + -3.6 = 0.0 0.0 + x = 3.736308338 + -3.6 x = 3.736308338 + -3.6 Combine like terms: 3.736308338 + -3.6 = 0.136308338 x = 0.136308338 Simplifying x = 0.136308338

Subproblem 2

x + 3.6 = -3.736308338 Simplifying x + 3.6 = -3.736308338 Reorder the terms: 3.6 + x = -3.736308338 Solving 3.6 + x = -3.736308338 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.6' to each side of the equation. 3.6 + -3.6 + x = -3.736308338 + -3.6 Combine like terms: 3.6 + -3.6 = 0.0 0.0 + x = -3.736308338 + -3.6 x = -3.736308338 + -3.6 Combine like terms: -3.736308338 + -3.6 = -7.336308338 x = -7.336308338 Simplifying x = -7.336308338

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.136308338, -7.336308338}

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