5x^2+1x-36=0

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Solution for 5x^2+1x-36=0 equation:


Simplifying
5x2 + 1x + -36 = 0

Reorder the terms:
-36 + 1x + 5x2 = 0

Solving
-36 + 1x + 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 + 0.2x + x2 = 0

Move the constant term to the right:

Add '7.2' to each side of the equation.
-7.2 + 0.2x + 7.2 + x2 = 0 + 7.2

Reorder the terms:
-7.2 + 7.2 + 0.2x + x2 = 0 + 7.2

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + 0.2x + x2 = 0 + 7.2
0.2x + x2 = 0 + 7.2

Combine like terms: 0 + 7.2 = 7.2
0.2x + x2 = 7.2

The x term is 0.2x.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2x + 0.01 + x2 = 7.2 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 7.2 + 0.01

Combine like terms: 7.2 + 0.01 = 7.21
0.01 + 0.2x + x2 = 7.21

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 7.21

Calculate the square root of the right side: 2.685144316

Break this problem into two subproblems by setting 
(x + 0.1) equal to 2.685144316 and -2.685144316.

Subproblem 1

x + 0.1 = 2.685144316 Simplifying x + 0.1 = 2.685144316 Reorder the terms: 0.1 + x = 2.685144316 Solving 0.1 + x = 2.685144316 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = 2.685144316 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 2.685144316 + -0.1 x = 2.685144316 + -0.1 Combine like terms: 2.685144316 + -0.1 = 2.585144316 x = 2.585144316 Simplifying x = 2.585144316

Subproblem 2

x + 0.1 = -2.685144316 Simplifying x + 0.1 = -2.685144316 Reorder the terms: 0.1 + x = -2.685144316 Solving 0.1 + x = -2.685144316 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = -2.685144316 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -2.685144316 + -0.1 x = -2.685144316 + -0.1 Combine like terms: -2.685144316 + -0.1 = -2.785144316 x = -2.785144316 Simplifying x = -2.785144316

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.585144316, -2.785144316}

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