2x^2+6x-247=0

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Solution for 2x^2+6x-247=0 equation:


Simplifying
2x2 + 6x + -247 = 0

Reorder the terms:
-247 + 6x + 2x2 = 0

Solving
-247 + 6x + 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'.
-123.5 + 3x + x2 = 0

Move the constant term to the right:

Add '123.5' to each side of the equation.
-123.5 + 3x + 123.5 + x2 = 0 + 123.5

Reorder the terms:
-123.5 + 123.5 + 3x + x2 = 0 + 123.5

Combine like terms: -123.5 + 123.5 = 0.0
0.0 + 3x + x2 = 0 + 123.5
3x + x2 = 0 + 123.5

Combine like terms: 0 + 123.5 = 123.5
3x + x2 = 123.5

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 123.5 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 123.5 + 2.25

Combine like terms: 123.5 + 2.25 = 125.75
2.25 + 3x + x2 = 125.75

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 125.75

Calculate the square root of the right side: 11.213830746

Break this problem into two subproblems by setting 
(x + 1.5) equal to 11.213830746 and -11.213830746.

Subproblem 1

x + 1.5 = 11.213830746 Simplifying x + 1.5 = 11.213830746 Reorder the terms: 1.5 + x = 11.213830746 Solving 1.5 + x = 11.213830746 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 11.213830746 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 11.213830746 + -1.5 x = 11.213830746 + -1.5 Combine like terms: 11.213830746 + -1.5 = 9.713830746 x = 9.713830746 Simplifying x = 9.713830746

Subproblem 2

x + 1.5 = -11.213830746 Simplifying x + 1.5 = -11.213830746 Reorder the terms: 1.5 + x = -11.213830746 Solving 1.5 + x = -11.213830746 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -11.213830746 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -11.213830746 + -1.5 x = -11.213830746 + -1.5 Combine like terms: -11.213830746 + -1.5 = -12.713830746 x = -12.713830746 Simplifying x = -12.713830746

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.713830746, -12.713830746}

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