x(x+8)=480

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Solution for x(x+8)=480 equation:


Simplifying
x(x + 8) = 480

Reorder the terms:
x(8 + x) = 480
(8 * x + x * x) = 480
(8x + x2) = 480

Solving
8x + x2 = 480

Solving for variable 'x'.

Reorder the terms:
-480 + 8x + x2 = 480 + -480

Combine like terms: 480 + -480 = 0
-480 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '480' to each side of the equation.
-480 + 8x + 480 + x2 = 0 + 480

Reorder the terms:
-480 + 480 + 8x + x2 = 0 + 480

Combine like terms: -480 + 480 = 0
0 + 8x + x2 = 0 + 480
8x + x2 = 0 + 480

Combine like terms: 0 + 480 = 480
8x + x2 = 480

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 480 + 16

Reorder the terms:
16 + 8x + x2 = 480 + 16

Combine like terms: 480 + 16 = 496
16 + 8x + x2 = 496

Factor a perfect square on the left side:
(x + 4)(x + 4) = 496

Calculate the square root of the right side: 22.271057451

Break this problem into two subproblems by setting 
(x + 4) equal to 22.271057451 and -22.271057451.

Subproblem 1

x + 4 = 22.271057451 Simplifying x + 4 = 22.271057451 Reorder the terms: 4 + x = 22.271057451 Solving 4 + x = 22.271057451 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 22.271057451 + -4 Combine like terms: 4 + -4 = 0 0 + x = 22.271057451 + -4 x = 22.271057451 + -4 Combine like terms: 22.271057451 + -4 = 18.271057451 x = 18.271057451 Simplifying x = 18.271057451

Subproblem 2

x + 4 = -22.271057451 Simplifying x + 4 = -22.271057451 Reorder the terms: 4 + x = -22.271057451 Solving 4 + x = -22.271057451 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -22.271057451 + -4 Combine like terms: 4 + -4 = 0 0 + x = -22.271057451 + -4 x = -22.271057451 + -4 Combine like terms: -22.271057451 + -4 = -26.271057451 x = -26.271057451 Simplifying x = -26.271057451

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.271057451, -26.271057451}

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