2x^2+24x+57=0

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Solution for 2x^2+24x+57=0 equation:


Simplifying
2x2 + 24x + 57 = 0

Reorder the terms:
57 + 24x + 2x2 = 0

Solving
57 + 24x + 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'.
28.5 + 12x + x2 = 0

Move the constant term to the right:

Add '-28.5' to each side of the equation.
28.5 + 12x + -28.5 + x2 = 0 + -28.5

Reorder the terms:
28.5 + -28.5 + 12x + x2 = 0 + -28.5

Combine like terms: 28.5 + -28.5 = 0.0
0.0 + 12x + x2 = 0 + -28.5
12x + x2 = 0 + -28.5

Combine like terms: 0 + -28.5 = -28.5
12x + x2 = -28.5

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = -28.5 + 36

Reorder the terms:
36 + 12x + x2 = -28.5 + 36

Combine like terms: -28.5 + 36 = 7.5
36 + 12x + x2 = 7.5

Factor a perfect square on the left side:
(x + 6)(x + 6) = 7.5

Calculate the square root of the right side: 2.738612788

Break this problem into two subproblems by setting 
(x + 6) equal to 2.738612788 and -2.738612788.

Subproblem 1

x + 6 = 2.738612788 Simplifying x + 6 = 2.738612788 Reorder the terms: 6 + x = 2.738612788 Solving 6 + x = 2.738612788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 2.738612788 + -6 Combine like terms: 6 + -6 = 0 0 + x = 2.738612788 + -6 x = 2.738612788 + -6 Combine like terms: 2.738612788 + -6 = -3.261387212 x = -3.261387212 Simplifying x = -3.261387212

Subproblem 2

x + 6 = -2.738612788 Simplifying x + 6 = -2.738612788 Reorder the terms: 6 + x = -2.738612788 Solving 6 + x = -2.738612788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -2.738612788 + -6 Combine like terms: 6 + -6 = 0 0 + x = -2.738612788 + -6 x = -2.738612788 + -6 Combine like terms: -2.738612788 + -6 = -8.738612788 x = -8.738612788 Simplifying x = -8.738612788

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.261387212, -8.738612788}

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