x(x-5)=99

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Solution for x(x-5)=99 equation:


Simplifying
x(x + -5) = 99

Reorder the terms:
x(-5 + x) = 99
(-5 * x + x * x) = 99
(-5x + x2) = 99

Solving
-5x + x2 = 99

Solving for variable 'x'.

Reorder the terms:
-99 + -5x + x2 = 99 + -99

Combine like terms: 99 + -99 = 0
-99 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '99' to each side of the equation.
-99 + -5x + 99 + x2 = 0 + 99

Reorder the terms:
-99 + 99 + -5x + x2 = 0 + 99

Combine like terms: -99 + 99 = 0
0 + -5x + x2 = 0 + 99
-5x + x2 = 0 + 99

Combine like terms: 0 + 99 = 99
-5x + x2 = 99

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 99 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 99 + 6.25

Combine like terms: 99 + 6.25 = 105.25
6.25 + -5x + x2 = 105.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 105.25

Calculate the square root of the right side: 10.259142264

Break this problem into two subproblems by setting 
(x + -2.5) equal to 10.259142264 and -10.259142264.

Subproblem 1

x + -2.5 = 10.259142264 Simplifying x + -2.5 = 10.259142264 Reorder the terms: -2.5 + x = 10.259142264 Solving -2.5 + x = 10.259142264 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 10.259142264 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 10.259142264 + 2.5 x = 10.259142264 + 2.5 Combine like terms: 10.259142264 + 2.5 = 12.759142264 x = 12.759142264 Simplifying x = 12.759142264

Subproblem 2

x + -2.5 = -10.259142264 Simplifying x + -2.5 = -10.259142264 Reorder the terms: -2.5 + x = -10.259142264 Solving -2.5 + x = -10.259142264 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -10.259142264 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -10.259142264 + 2.5 x = -10.259142264 + 2.5 Combine like terms: -10.259142264 + 2.5 = -7.759142264 x = -7.759142264 Simplifying x = -7.759142264

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.759142264, -7.759142264}

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