2x^2+13x=186

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Solution for 2x^2+13x=186 equation:


Simplifying
2x2 + 13x = 186

Reorder the terms:
13x + 2x2 = 186

Solving
13x + 2x2 = 186

Solving for variable 'x'.

Reorder the terms:
-186 + 13x + 2x2 = 186 + -186

Combine like terms: 186 + -186 = 0
-186 + 13x + 2x2 = 0

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

Divide each side by '2'.
-93 + 6.5x + x2 = 0

Move the constant term to the right:

Add '93' to each side of the equation.
-93 + 6.5x + 93 + x2 = 0 + 93

Reorder the terms:
-93 + 93 + 6.5x + x2 = 0 + 93

Combine like terms: -93 + 93 = 0
0 + 6.5x + x2 = 0 + 93
6.5x + x2 = 0 + 93

Combine like terms: 0 + 93 = 93
6.5x + x2 = 93

The x term is 6.5x.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5x + 10.5625 + x2 = 93 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = 93 + 10.5625

Combine like terms: 93 + 10.5625 = 103.5625
10.5625 + 6.5x + x2 = 103.5625

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 103.5625

Calculate the square root of the right side: 10.176566219

Break this problem into two subproblems by setting 
(x + 3.25) equal to 10.176566219 and -10.176566219.

Subproblem 1

x + 3.25 = 10.176566219 Simplifying x + 3.25 = 10.176566219 Reorder the terms: 3.25 + x = 10.176566219 Solving 3.25 + x = 10.176566219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 10.176566219 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 10.176566219 + -3.25 x = 10.176566219 + -3.25 Combine like terms: 10.176566219 + -3.25 = 6.926566219 x = 6.926566219 Simplifying x = 6.926566219

Subproblem 2

x + 3.25 = -10.176566219 Simplifying x + 3.25 = -10.176566219 Reorder the terms: 3.25 + x = -10.176566219 Solving 3.25 + x = -10.176566219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -10.176566219 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -10.176566219 + -3.25 x = -10.176566219 + -3.25 Combine like terms: -10.176566219 + -3.25 = -13.426566219 x = -13.426566219 Simplifying x = -13.426566219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.926566219, -13.426566219}

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