x(x+5)=200

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Solution for x(x+5)=200 equation:


Simplifying
x(x + 5) = 200

Reorder the terms:
x(5 + x) = 200
(5 * x + x * x) = 200
(5x + x2) = 200

Solving
5x + x2 = 200

Solving for variable 'x'.

Reorder the terms:
-200 + 5x + x2 = 200 + -200

Combine like terms: 200 + -200 = 0
-200 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + 5x + 200 + x2 = 0 + 200

Reorder the terms:
-200 + 200 + 5x + x2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + 5x + x2 = 0 + 200
5x + x2 = 0 + 200

Combine like terms: 0 + 200 = 200
5x + x2 = 200

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 = 200 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 200 + 6.25

Combine like terms: 200 + 6.25 = 206.25
6.25 + 5x + x2 = 206.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 206.25

Calculate the square root of the right side: 14.361406616

Break this problem into two subproblems by setting 
(x + 2.5) equal to 14.361406616 and -14.361406616.

Subproblem 1

x + 2.5 = 14.361406616 Simplifying x + 2.5 = 14.361406616 Reorder the terms: 2.5 + x = 14.361406616 Solving 2.5 + x = 14.361406616 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 = 14.361406616 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 14.361406616 + -2.5 x = 14.361406616 + -2.5 Combine like terms: 14.361406616 + -2.5 = 11.861406616 x = 11.861406616 Simplifying x = 11.861406616

Subproblem 2

x + 2.5 = -14.361406616 Simplifying x + 2.5 = -14.361406616 Reorder the terms: 2.5 + x = -14.361406616 Solving 2.5 + x = -14.361406616 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 = -14.361406616 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -14.361406616 + -2.5 x = -14.361406616 + -2.5 Combine like terms: -14.361406616 + -2.5 = -16.861406616 x = -16.861406616 Simplifying x = -16.861406616

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.861406616, -16.861406616}

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