(2x+5)(x)=460

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Solution for (2x+5)(x)=460 equation:


Simplifying
(2x + 5)(x) = 460

Reorder the terms:
(5 + 2x)(x) = 460

Reorder the terms for easier multiplication:
x(5 + 2x) = 460
(5 * x + 2x * x) = 460
(5x + 2x2) = 460

Solving
5x + 2x2 = 460

Solving for variable 'x'.

Reorder the terms:
-460 + 5x + 2x2 = 460 + -460

Combine like terms: 460 + -460 = 0
-460 + 5x + 2x2 = 0

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

Divide each side by '2'.
-230 + 2.5x + x2 = 0

Move the constant term to the right:

Add '230' to each side of the equation.
-230 + 2.5x + 230 + x2 = 0 + 230

Reorder the terms:
-230 + 230 + 2.5x + x2 = 0 + 230

Combine like terms: -230 + 230 = 0
0 + 2.5x + x2 = 0 + 230
2.5x + x2 = 0 + 230

Combine like terms: 0 + 230 = 230
2.5x + x2 = 230

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 230 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 230 + 1.5625

Combine like terms: 230 + 1.5625 = 231.5625
1.5625 + 2.5x + x2 = 231.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 231.5625

Calculate the square root of the right side: 15.217177794

Break this problem into two subproblems by setting 
(x + 1.25) equal to 15.217177794 and -15.217177794.

Subproblem 1

x + 1.25 = 15.217177794 Simplifying x + 1.25 = 15.217177794 Reorder the terms: 1.25 + x = 15.217177794 Solving 1.25 + x = 15.217177794 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 15.217177794 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 15.217177794 + -1.25 x = 15.217177794 + -1.25 Combine like terms: 15.217177794 + -1.25 = 13.967177794 x = 13.967177794 Simplifying x = 13.967177794

Subproblem 2

x + 1.25 = -15.217177794 Simplifying x + 1.25 = -15.217177794 Reorder the terms: 1.25 + x = -15.217177794 Solving 1.25 + x = -15.217177794 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -15.217177794 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -15.217177794 + -1.25 x = -15.217177794 + -1.25 Combine like terms: -15.217177794 + -1.25 = -16.467177794 x = -16.467177794 Simplifying x = -16.467177794

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.967177794, -16.467177794}

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