x*(2x+7)=460

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Solution for x*(2x+7)=460 equation:


Simplifying
x(2x + 7) = 460

Reorder the terms:
x(7 + 2x) = 460
(7 * x + 2x * x) = 460
(7x + 2x2) = 460

Solving
7x + 2x2 = 460

Solving for variable 'x'.

Reorder the terms:
-460 + 7x + 2x2 = 460 + -460

Combine like terms: 460 + -460 = 0
-460 + 7x + 2x2 = 0

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

Divide each side by '2'.
-230 + 3.5x + x2 = 0

Move the constant term to the right:

Add '230' to each side of the equation.
-230 + 3.5x + 230 + x2 = 0 + 230

Reorder the terms:
-230 + 230 + 3.5x + x2 = 0 + 230

Combine like terms: -230 + 230 = 0
0 + 3.5x + x2 = 0 + 230
3.5x + x2 = 0 + 230

Combine like terms: 0 + 230 = 230
3.5x + x2 = 230

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 230 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 230 + 3.0625

Combine like terms: 230 + 3.0625 = 233.0625
3.0625 + 3.5x + x2 = 233.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 233.0625

Calculate the square root of the right side: 15.266384641

Break this problem into two subproblems by setting 
(x + 1.75) equal to 15.266384641 and -15.266384641.

Subproblem 1

x + 1.75 = 15.266384641 Simplifying x + 1.75 = 15.266384641 Reorder the terms: 1.75 + x = 15.266384641 Solving 1.75 + x = 15.266384641 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 15.266384641 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 15.266384641 + -1.75 x = 15.266384641 + -1.75 Combine like terms: 15.266384641 + -1.75 = 13.516384641 x = 13.516384641 Simplifying x = 13.516384641

Subproblem 2

x + 1.75 = -15.266384641 Simplifying x + 1.75 = -15.266384641 Reorder the terms: 1.75 + x = -15.266384641 Solving 1.75 + x = -15.266384641 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -15.266384641 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -15.266384641 + -1.75 x = -15.266384641 + -1.75 Combine like terms: -15.266384641 + -1.75 = -17.016384641 x = -17.016384641 Simplifying x = -17.016384641

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.516384641, -17.016384641}

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