5x^2-36=5x

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


Simplifying
5x2 + -36 = 5x

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

Solving
-36 + 5x2 = 5x

Solving for variable 'x'.

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

Combine like terms: 5x + -5x = 0
-36 + -5x + 5x2 = 0

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

Divide each side by '5'.
-7.2 + -1x + x2 = 0

Move the constant term to the right:

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

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

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + -1x + x2 = 0 + 7.2
-1x + x2 = 0 + 7.2

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

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 7.2 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 7.2 + 0.25

Combine like terms: 7.2 + 0.25 = 7.45
0.25 + -1x + x2 = 7.45

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 7.45

Calculate the square root of the right side: 2.729468813

Break this problem into two subproblems by setting 
(x + -0.5) equal to 2.729468813 and -2.729468813.

Subproblem 1

x + -0.5 = 2.729468813 Simplifying x + -0.5 = 2.729468813 Reorder the terms: -0.5 + x = 2.729468813 Solving -0.5 + x = 2.729468813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 2.729468813 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 2.729468813 + 0.5 x = 2.729468813 + 0.5 Combine like terms: 2.729468813 + 0.5 = 3.229468813 x = 3.229468813 Simplifying x = 3.229468813

Subproblem 2

x + -0.5 = -2.729468813 Simplifying x + -0.5 = -2.729468813 Reorder the terms: -0.5 + x = -2.729468813 Solving -0.5 + x = -2.729468813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -2.729468813 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -2.729468813 + 0.5 x = -2.729468813 + 0.5 Combine like terms: -2.729468813 + 0.5 = -2.229468813 x = -2.229468813 Simplifying x = -2.229468813

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.229468813, -2.229468813}

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