66-5x=5x^2

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Solution for 66-5x=5x^2 equation:


Simplifying
66 + -5x = 5x2

Solving
66 + -5x = 5x2

Solving for variable 'x'.

Combine like terms: 5x2 + -5x2 = 0
66 + -5x + -5x2 = 0

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

Divide each side by '-5'.
-13.2 + x + x2 = 0

Move the constant term to the right:

Add '13.2' to each side of the equation.
-13.2 + x + 13.2 + x2 = 0 + 13.2

Reorder the terms:
-13.2 + 13.2 + x + x2 = 0 + 13.2

Combine like terms: -13.2 + 13.2 = 0.0
0.0 + x + x2 = 0 + 13.2
x + x2 = 0 + 13.2

Combine like terms: 0 + 13.2 = 13.2
x + x2 = 13.2

The x term is x.  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.
 + 0.25 + x2 = 13.2 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 13.2 + 0.25

Combine like terms: 13.2 + 0.25 = 13.45
1.25 + x2 = 13.45

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 13.45

Calculate the square root of the right side: 3.667424164

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.667424164 and -3.667424164.

Subproblem 1

x + 0.5 = 3.667424164 Simplifying x + 0.5 = 3.667424164 Reorder the terms: 0.5 + x = 3.667424164 Solving 0.5 + x = 3.667424164 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 = 3.667424164 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.667424164 + -0.5 x = 3.667424164 + -0.5 Combine like terms: 3.667424164 + -0.5 = 3.167424164 x = 3.167424164 Simplifying x = 3.167424164

Subproblem 2

x + 0.5 = -3.667424164 Simplifying x + 0.5 = -3.667424164 Reorder the terms: 0.5 + x = -3.667424164 Solving 0.5 + x = -3.667424164 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 = -3.667424164 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.667424164 + -0.5 x = -3.667424164 + -0.5 Combine like terms: -3.667424164 + -0.5 = -4.167424164 x = -4.167424164 Simplifying x = -4.167424164

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.167424164, -4.167424164}

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