x(x+2)=480

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Solution for x(x+2)=480 equation:


Simplifying
x(x + 2) = 480

Reorder the terms:
x(2 + x) = 480
(2 * x + x * x) = 480
(2x + x2) = 480

Solving
2x + x2 = 480

Solving for variable 'x'.

Reorder the terms:
-480 + 2x + x2 = 480 + -480

Combine like terms: 480 + -480 = 0
-480 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '480' to each side of the equation.
-480 + 2x + 480 + x2 = 0 + 480

Reorder the terms:
-480 + 480 + 2x + x2 = 0 + 480

Combine like terms: -480 + 480 = 0
0 + 2x + x2 = 0 + 480
2x + x2 = 0 + 480

Combine like terms: 0 + 480 = 480
2x + x2 = 480

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 480 + 1

Reorder the terms:
1 + 2x + x2 = 480 + 1

Combine like terms: 480 + 1 = 481
1 + 2x + x2 = 481

Factor a perfect square on the left side:
(x + 1)(x + 1) = 481

Calculate the square root of the right side: 21.931712199

Break this problem into two subproblems by setting 
(x + 1) equal to 21.931712199 and -21.931712199.

Subproblem 1

x + 1 = 21.931712199 Simplifying x + 1 = 21.931712199 Reorder the terms: 1 + x = 21.931712199 Solving 1 + x = 21.931712199 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 21.931712199 + -1 Combine like terms: 1 + -1 = 0 0 + x = 21.931712199 + -1 x = 21.931712199 + -1 Combine like terms: 21.931712199 + -1 = 20.931712199 x = 20.931712199 Simplifying x = 20.931712199

Subproblem 2

x + 1 = -21.931712199 Simplifying x + 1 = -21.931712199 Reorder the terms: 1 + x = -21.931712199 Solving 1 + x = -21.931712199 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -21.931712199 + -1 Combine like terms: 1 + -1 = 0 0 + x = -21.931712199 + -1 x = -21.931712199 + -1 Combine like terms: -21.931712199 + -1 = -22.931712199 x = -22.931712199 Simplifying x = -22.931712199

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.931712199, -22.931712199}

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