(2x+7)(x)=340

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Solution for (2x+7)(x)=340 equation:


Simplifying
(2x + 7)(x) = 340

Reorder the terms:
(7 + 2x)(x) = 340

Reorder the terms for easier multiplication:
x(7 + 2x) = 340
(7 * x + 2x * x) = 340
(7x + 2x2) = 340

Solving
7x + 2x2 = 340

Solving for variable 'x'.

Reorder the terms:
-340 + 7x + 2x2 = 340 + -340

Combine like terms: 340 + -340 = 0
-340 + 7x + 2x2 = 0

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

Divide each side by '2'.
-170 + 3.5x + x2 = 0

Move the constant term to the right:

Add '170' to each side of the equation.
-170 + 3.5x + 170 + x2 = 0 + 170

Reorder the terms:
-170 + 170 + 3.5x + x2 = 0 + 170

Combine like terms: -170 + 170 = 0
0 + 3.5x + x2 = 0 + 170
3.5x + x2 = 0 + 170

Combine like terms: 0 + 170 = 170
3.5x + x2 = 170

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 = 170 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 170 + 3.0625

Combine like terms: 170 + 3.0625 = 173.0625
3.0625 + 3.5x + x2 = 173.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 173.0625

Calculate the square root of the right side: 13.155322117

Break this problem into two subproblems by setting 
(x + 1.75) equal to 13.155322117 and -13.155322117.

Subproblem 1

x + 1.75 = 13.155322117 Simplifying x + 1.75 = 13.155322117 Reorder the terms: 1.75 + x = 13.155322117 Solving 1.75 + x = 13.155322117 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 = 13.155322117 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 13.155322117 + -1.75 x = 13.155322117 + -1.75 Combine like terms: 13.155322117 + -1.75 = 11.405322117 x = 11.405322117 Simplifying x = 11.405322117

Subproblem 2

x + 1.75 = -13.155322117 Simplifying x + 1.75 = -13.155322117 Reorder the terms: 1.75 + x = -13.155322117 Solving 1.75 + x = -13.155322117 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 = -13.155322117 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -13.155322117 + -1.75 x = -13.155322117 + -1.75 Combine like terms: -13.155322117 + -1.75 = -14.905322117 x = -14.905322117 Simplifying x = -14.905322117

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.405322117, -14.905322117}

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