2x^2+26x+65=0

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Solution for 2x^2+26x+65=0 equation:


Simplifying
2x2 + 26x + 65 = 0

Reorder the terms:
65 + 26x + 2x2 = 0

Solving
65 + 26x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
32.5 + 13x + x2 = 0

Move the constant term to the right:

Add '-32.5' to each side of the equation.
32.5 + 13x + -32.5 + x2 = 0 + -32.5

Reorder the terms:
32.5 + -32.5 + 13x + x2 = 0 + -32.5

Combine like terms: 32.5 + -32.5 = 0.0
0.0 + 13x + x2 = 0 + -32.5
13x + x2 = 0 + -32.5

Combine like terms: 0 + -32.5 = -32.5
13x + x2 = -32.5

The x term is 13x.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13x + 42.25 + x2 = -32.5 + 42.25

Reorder the terms:
42.25 + 13x + x2 = -32.5 + 42.25

Combine like terms: -32.5 + 42.25 = 9.75
42.25 + 13x + x2 = 9.75

Factor a perfect square on the left side:
(x + 6.5)(x + 6.5) = 9.75

Calculate the square root of the right side: 3.122498999

Break this problem into two subproblems by setting 
(x + 6.5) equal to 3.122498999 and -3.122498999.

Subproblem 1

x + 6.5 = 3.122498999 Simplifying x + 6.5 = 3.122498999 Reorder the terms: 6.5 + x = 3.122498999 Solving 6.5 + x = 3.122498999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = 3.122498999 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = 3.122498999 + -6.5 x = 3.122498999 + -6.5 Combine like terms: 3.122498999 + -6.5 = -3.377501001 x = -3.377501001 Simplifying x = -3.377501001

Subproblem 2

x + 6.5 = -3.122498999 Simplifying x + 6.5 = -3.122498999 Reorder the terms: 6.5 + x = -3.122498999 Solving 6.5 + x = -3.122498999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = -3.122498999 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = -3.122498999 + -6.5 x = -3.122498999 + -6.5 Combine like terms: -3.122498999 + -6.5 = -9.622498999 x = -9.622498999 Simplifying x = -9.622498999

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.377501001, -9.622498999}

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