x(x-4)=2.25

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Solution for x(x-4)=2.25 equation: 


Simplifying
x(x + -4) = 2.25

Reorder the terms:
x(-4 + x) = 2.25
(-4 * x + x * x) = 2.25
(-4x + x2) = 2.25

Solving
-4x + x2 = 2.25

Solving for variable 'x'.

Reorder the terms:
-2.25 + -4x + x2 = 2.25 + -2.25

Combine like terms: 2.25 + -2.25 = 0.00
-2.25 + -4x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + -4x + 2.25 + x2 = 0.00 + 2.25

Reorder the terms:
-2.25 + 2.25 + -4x + x2 = 0.00 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + -4x + x2 = 0.00 + 2.25
-4x + x2 = 0.00 + 2.25

Combine like terms: 0.00 + 2.25 = 2.25
-4x + x2 = 2.25

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 2.25 + 4

Reorder the terms:
4 + -4x + x2 = 2.25 + 4

Combine like terms: 2.25 + 4 = 6.25
4 + -4x + x2 = 6.25

Factor a perfect square on the left side:
(x + -2)(x + -2) = 6.25

Calculate the square root of the right side: 2.5

Break this problem into two subproblems by setting 
(x + -2) equal to 2.5 and -2.5.


Subproblem 1
x + -2 = 2.5

Simplifying
x + -2 = 2.5

Reorder the terms:
-2 + x = 2.5

Solving
-2 + x = 2.5

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + x = 2.5 + 2

Combine like terms: -2 + 2 = 0
0 + x = 2.5 + 2
x = 2.5 + 2

Combine like terms: 2.5 + 2 = 4.5
x = 4.5

Simplifying
x = 4.5


Subproblem 2
x + -2 = -2.5

Simplifying
x + -2 = -2.5

Reorder the terms:
-2 + x = -2.5

Solving
-2 + x = -2.5

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + x = -2.5 + 2

Combine like terms: -2 + 2 = 0
0 + x = -2.5 + 2
x = -2.5 + 2

Combine like terms: -2.5 + 2 = -0.5
x = -0.5

Simplifying
x = -0.5


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {4.5, -0.5}

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