(2x+9)(x)=460

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Solution for (2x+9)(x)=460 equation:


Simplifying
(2x + 9)(x) = 460

Reorder the terms:
(9 + 2x)(x) = 460

Reorder the terms for easier multiplication:
x(9 + 2x) = 460
(9 * x + 2x * x) = 460
(9x + 2x2) = 460

Solving
9x + 2x2 = 460

Solving for variable 'x'.

Reorder the terms:
-460 + 9x + 2x2 = 460 + -460

Combine like terms: 460 + -460 = 0
-460 + 9x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-230 + 4.5x + x2 = 0

Move the constant term to the right:

Add '230' to each side of the equation.
-230 + 4.5x + 230 + x2 = 0 + 230

Reorder the terms:
-230 + 230 + 4.5x + x2 = 0 + 230

Combine like terms: -230 + 230 = 0
0 + 4.5x + x2 = 0 + 230
4.5x + x2 = 0 + 230

Combine like terms: 0 + 230 = 230
4.5x + x2 = 230

The x term is 4.5x.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5x + 5.0625 + x2 = 230 + 5.0625

Reorder the terms:
5.0625 + 4.5x + x2 = 230 + 5.0625

Combine like terms: 230 + 5.0625 = 235.0625
5.0625 + 4.5x + x2 = 235.0625

Factor a perfect square on the left side:
(x + 2.25)(x + 2.25) = 235.0625

Calculate the square root of the right side: 15.331748106

Break this problem into two subproblems by setting 
(x + 2.25) equal to 15.331748106 and -15.331748106.

Subproblem 1

x + 2.25 = 15.331748106 Simplifying x + 2.25 = 15.331748106 Reorder the terms: 2.25 + x = 15.331748106 Solving 2.25 + x = 15.331748106 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = 15.331748106 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = 15.331748106 + -2.25 x = 15.331748106 + -2.25 Combine like terms: 15.331748106 + -2.25 = 13.081748106 x = 13.081748106 Simplifying x = 13.081748106

Subproblem 2

x + 2.25 = -15.331748106 Simplifying x + 2.25 = -15.331748106 Reorder the terms: 2.25 + x = -15.331748106 Solving 2.25 + x = -15.331748106 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = -15.331748106 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = -15.331748106 + -2.25 x = -15.331748106 + -2.25 Combine like terms: -15.331748106 + -2.25 = -17.581748106 x = -17.581748106 Simplifying x = -17.581748106

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.081748106, -17.581748106}

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