x^2-5=9x

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Solution for x^2-5=9x equation:


Simplifying
x2 + -5 = 9x

Reorder the terms:
-5 + x2 = 9x

Solving
-5 + x2 = 9x

Solving for variable 'x'.

Reorder the terms:
-5 + -9x + x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
-5 + -9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -9x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -9x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -9x + x2 = 0 + 5
-9x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-9x + x2 = 5

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = 5 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 5 + 20.25

Combine like terms: 5 + 20.25 = 25.25
20.25 + -9x + x2 = 25.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 25.25

Calculate the square root of the right side: 5.024937811

Break this problem into two subproblems by setting 
(x + -4.5) equal to 5.024937811 and -5.024937811.

Subproblem 1

x + -4.5 = 5.024937811 Simplifying x + -4.5 = 5.024937811 Reorder the terms: -4.5 + x = 5.024937811 Solving -4.5 + x = 5.024937811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 5.024937811 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 5.024937811 + 4.5 x = 5.024937811 + 4.5 Combine like terms: 5.024937811 + 4.5 = 9.524937811 x = 9.524937811 Simplifying x = 9.524937811

Subproblem 2

x + -4.5 = -5.024937811 Simplifying x + -4.5 = -5.024937811 Reorder the terms: -4.5 + x = -5.024937811 Solving -4.5 + x = -5.024937811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -5.024937811 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -5.024937811 + 4.5 x = -5.024937811 + 4.5 Combine like terms: -5.024937811 + 4.5 = -0.524937811 x = -0.524937811 Simplifying x = -0.524937811

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.524937811, -0.524937811}

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