x(x+3)=265

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Solution for x(x+3)=265 equation:


Simplifying
x(x + 3) = 265

Reorder the terms:
x(3 + x) = 265
(3 * x + x * x) = 265
(3x + x2) = 265

Solving
3x + x2 = 265

Solving for variable 'x'.

Reorder the terms:
-265 + 3x + x2 = 265 + -265

Combine like terms: 265 + -265 = 0
-265 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '265' to each side of the equation.
-265 + 3x + 265 + x2 = 0 + 265

Reorder the terms:
-265 + 265 + 3x + x2 = 0 + 265

Combine like terms: -265 + 265 = 0
0 + 3x + x2 = 0 + 265
3x + x2 = 0 + 265

Combine like terms: 0 + 265 = 265
3x + x2 = 265

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 265 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 265 + 2.25

Combine like terms: 265 + 2.25 = 267.25
2.25 + 3x + x2 = 267.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 267.25

Calculate the square root of the right side: 16.347782724

Break this problem into two subproblems by setting 
(x + 1.5) equal to 16.347782724 and -16.347782724.

Subproblem 1

x + 1.5 = 16.347782724 Simplifying x + 1.5 = 16.347782724 Reorder the terms: 1.5 + x = 16.347782724 Solving 1.5 + x = 16.347782724 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 16.347782724 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 16.347782724 + -1.5 x = 16.347782724 + -1.5 Combine like terms: 16.347782724 + -1.5 = 14.847782724 x = 14.847782724 Simplifying x = 14.847782724

Subproblem 2

x + 1.5 = -16.347782724 Simplifying x + 1.5 = -16.347782724 Reorder the terms: 1.5 + x = -16.347782724 Solving 1.5 + x = -16.347782724 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -16.347782724 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -16.347782724 + -1.5 x = -16.347782724 + -1.5 Combine like terms: -16.347782724 + -1.5 = -17.847782724 x = -17.847782724 Simplifying x = -17.847782724

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.847782724, -17.847782724}

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