3x^2-x-27=0

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Solution for 3x^2-x-27=0 equation:


Simplifying
3x2 + -1x + -27 = 0

Reorder the terms:
-27 + -1x + 3x2 = 0

Solving
-27 + -1x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-9 + -0.3333333333x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -0.3333333333x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -0.3333333333x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -0.3333333333x + x2 = 0 + 9
-0.3333333333x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-0.3333333333x + x2 = 9

The x term is -0.3333333333x.  Take half its coefficient (-0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
-0.3333333333x + 0.02777777779 + x2 = 9 + 0.02777777779

Reorder the terms:
0.02777777779 + -0.3333333333x + x2 = 9 + 0.02777777779

Combine like terms: 9 + 0.02777777779 = 9.02777777779
0.02777777779 + -0.3333333333x + x2 = 9.02777777779

Factor a perfect square on the left side:
(x + -0.1666666667)(x + -0.1666666667) = 9.02777777779

Calculate the square root of the right side: 3.004626063

Break this problem into two subproblems by setting 
(x + -0.1666666667) equal to 3.004626063 and -3.004626063.

Subproblem 1

x + -0.1666666667 = 3.004626063 Simplifying x + -0.1666666667 = 3.004626063 Reorder the terms: -0.1666666667 + x = 3.004626063 Solving -0.1666666667 + x = 3.004626063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1666666667' to each side of the equation. -0.1666666667 + 0.1666666667 + x = 3.004626063 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + x = 3.004626063 + 0.1666666667 x = 3.004626063 + 0.1666666667 Combine like terms: 3.004626063 + 0.1666666667 = 3.1712927297 x = 3.1712927297 Simplifying x = 3.1712927297

Subproblem 2

x + -0.1666666667 = -3.004626063 Simplifying x + -0.1666666667 = -3.004626063 Reorder the terms: -0.1666666667 + x = -3.004626063 Solving -0.1666666667 + x = -3.004626063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1666666667' to each side of the equation. -0.1666666667 + 0.1666666667 + x = -3.004626063 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + x = -3.004626063 + 0.1666666667 x = -3.004626063 + 0.1666666667 Combine like terms: -3.004626063 + 0.1666666667 = -2.8379593963 x = -2.8379593963 Simplifying x = -2.8379593963

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.1712927297, -2.8379593963}

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