2x^2+14x-169=0

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Solution for 2x^2+14x-169=0 equation:


Simplifying
2x2 + 14x + -169 = 0

Reorder the terms:
-169 + 14x + 2x2 = 0

Solving
-169 + 14x + 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'.
-84.5 + 7x + x2 = 0

Move the constant term to the right:

Add '84.5' to each side of the equation.
-84.5 + 7x + 84.5 + x2 = 0 + 84.5

Reorder the terms:
-84.5 + 84.5 + 7x + x2 = 0 + 84.5

Combine like terms: -84.5 + 84.5 = 0.0
0.0 + 7x + x2 = 0 + 84.5
7x + x2 = 0 + 84.5

Combine like terms: 0 + 84.5 = 84.5
7x + x2 = 84.5

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 84.5 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 84.5 + 12.25

Combine like terms: 84.5 + 12.25 = 96.75
12.25 + 7x + x2 = 96.75

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 96.75

Calculate the square root of the right side: 9.836157786

Break this problem into two subproblems by setting 
(x + 3.5) equal to 9.836157786 and -9.836157786.

Subproblem 1

x + 3.5 = 9.836157786 Simplifying x + 3.5 = 9.836157786 Reorder the terms: 3.5 + x = 9.836157786 Solving 3.5 + x = 9.836157786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 9.836157786 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 9.836157786 + -3.5 x = 9.836157786 + -3.5 Combine like terms: 9.836157786 + -3.5 = 6.336157786 x = 6.336157786 Simplifying x = 6.336157786

Subproblem 2

x + 3.5 = -9.836157786 Simplifying x + 3.5 = -9.836157786 Reorder the terms: 3.5 + x = -9.836157786 Solving 3.5 + x = -9.836157786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -9.836157786 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -9.836157786 + -3.5 x = -9.836157786 + -3.5 Combine like terms: -9.836157786 + -3.5 = -13.336157786 x = -13.336157786 Simplifying x = -13.336157786

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.336157786, -13.336157786}

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