x(2x+5)=340

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Solution for x(2x+5)=340 equation:


Simplifying
x(2x + 5) = 340

Reorder the terms:
x(5 + 2x) = 340
(5 * x + 2x * x) = 340
(5x + 2x2) = 340

Solving
5x + 2x2 = 340

Solving for variable 'x'.

Reorder the terms:
-340 + 5x + 2x2 = 340 + -340

Combine like terms: 340 + -340 = 0
-340 + 5x + 2x2 = 0

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

Divide each side by '2'.
-170 + 2.5x + x2 = 0

Move the constant term to the right:

Add '170' to each side of the equation.
-170 + 2.5x + 170 + x2 = 0 + 170

Reorder the terms:
-170 + 170 + 2.5x + x2 = 0 + 170

Combine like terms: -170 + 170 = 0
0 + 2.5x + x2 = 0 + 170
2.5x + x2 = 0 + 170

Combine like terms: 0 + 170 = 170
2.5x + x2 = 170

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 = 170 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 170 + 1.5625

Combine like terms: 170 + 1.5625 = 171.5625
1.5625 + 2.5x + x2 = 171.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 171.5625

Calculate the square root of the right side: 13.098186897

Break this problem into two subproblems by setting 
(x + 1.25) equal to 13.098186897 and -13.098186897.

Subproblem 1

x + 1.25 = 13.098186897 Simplifying x + 1.25 = 13.098186897 Reorder the terms: 1.25 + x = 13.098186897 Solving 1.25 + x = 13.098186897 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 = 13.098186897 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 13.098186897 + -1.25 x = 13.098186897 + -1.25 Combine like terms: 13.098186897 + -1.25 = 11.848186897 x = 11.848186897 Simplifying x = 11.848186897

Subproblem 2

x + 1.25 = -13.098186897 Simplifying x + 1.25 = -13.098186897 Reorder the terms: 1.25 + x = -13.098186897 Solving 1.25 + x = -13.098186897 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 = -13.098186897 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -13.098186897 + -1.25 x = -13.098186897 + -1.25 Combine like terms: -13.098186897 + -1.25 = -14.348186897 x = -14.348186897 Simplifying x = -14.348186897

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.848186897, -14.348186897}

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