x(x+5)=2100

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Solution for x(x+5)=2100 equation:


Simplifying
x(x + 5) = 2100

Reorder the terms:
x(5 + x) = 2100
(5 * x + x * x) = 2100
(5x + x2) = 2100

Solving
5x + x2 = 2100

Solving for variable 'x'.

Reorder the terms:
-2100 + 5x + x2 = 2100 + -2100

Combine like terms: 2100 + -2100 = 0
-2100 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '2100' to each side of the equation.
-2100 + 5x + 2100 + x2 = 0 + 2100

Reorder the terms:
-2100 + 2100 + 5x + x2 = 0 + 2100

Combine like terms: -2100 + 2100 = 0
0 + 5x + x2 = 0 + 2100
5x + x2 = 0 + 2100

Combine like terms: 0 + 2100 = 2100
5x + x2 = 2100

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 = 2100 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 2100 + 6.25

Combine like terms: 2100 + 6.25 = 2106.25
6.25 + 5x + x2 = 2106.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 2106.25

Calculate the square root of the right side: 45.893899377

Break this problem into two subproblems by setting 
(x + 2.5) equal to 45.893899377 and -45.893899377.

Subproblem 1

x + 2.5 = 45.893899377 Simplifying x + 2.5 = 45.893899377 Reorder the terms: 2.5 + x = 45.893899377 Solving 2.5 + x = 45.893899377 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 = 45.893899377 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 45.893899377 + -2.5 x = 45.893899377 + -2.5 Combine like terms: 45.893899377 + -2.5 = 43.393899377 x = 43.393899377 Simplifying x = 43.393899377

Subproblem 2

x + 2.5 = -45.893899377 Simplifying x + 2.5 = -45.893899377 Reorder the terms: 2.5 + x = -45.893899377 Solving 2.5 + x = -45.893899377 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 = -45.893899377 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -45.893899377 + -2.5 x = -45.893899377 + -2.5 Combine like terms: -45.893899377 + -2.5 = -48.393899377 x = -48.393899377 Simplifying x = -48.393899377

Solution

The solution to the problem is based on the solutions from the subproblems. x = {43.393899377, -48.393899377}

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