2x^2+x-612=0

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Solution for 2x^2+x-612=0 equation:


Simplifying
2x2 + x + -612 = 0

Reorder the terms:
-612 + x + 2x2 = 0

Solving
-612 + x + 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'.
-306 + 0.5x + x2 = 0

Move the constant term to the right:

Add '306' to each side of the equation.
-306 + 0.5x + 306 + x2 = 0 + 306

Reorder the terms:
-306 + 306 + 0.5x + x2 = 0 + 306

Combine like terms: -306 + 306 = 0
0 + 0.5x + x2 = 0 + 306
0.5x + x2 = 0 + 306

Combine like terms: 0 + 306 = 306
0.5x + x2 = 306

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.5x + 0.25 + x2 = 306 + 0.25

Reorder the terms:
0.25 + 0.5x + x2 = 306 + 0.25

Combine like terms: 306 + 0.25 = 306.25
0.25 + 0.5x + x2 = 306.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 306.25

Calculate the square root of the right side: 17.5

Break this problem into two subproblems by setting 
(x + 0.5) equal to 17.5 and -17.5.

Subproblem 1

x + 0.5 = 17.5 Simplifying x + 0.5 = 17.5 Reorder the terms: 0.5 + x = 17.5 Solving 0.5 + x = 17.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 17.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 17.5 + -0.5 x = 17.5 + -0.5 Combine like terms: 17.5 + -0.5 = 17 x = 17 Simplifying x = 17

Subproblem 2

x + 0.5 = -17.5 Simplifying x + 0.5 = -17.5 Reorder the terms: 0.5 + x = -17.5 Solving 0.5 + x = -17.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -17.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -17.5 + -0.5 x = -17.5 + -0.5 Combine like terms: -17.5 + -0.5 = -18 x = -18 Simplifying x = -18

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17, -18}

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