0=3x^2-x-5

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Solution for 0=3x^2-x-5 equation:


Simplifying
0 = 3x2 + -1x + -5

Reorder the terms:
0 = -5 + -1x + 3x2

Solving
0 = -5 + -1x + 3x2

Solving for variable 'x'.

Combine like terms: 0 + 5 = 5
5 + x + -3x2 = -5 + -1x + 3x2 + 5 + x + -3x2

Reorder the terms:
5 + x + -3x2 = -5 + 5 + -1x + x + 3x2 + -3x2

Combine like terms: -5 + 5 = 0
5 + x + -3x2 = 0 + -1x + x + 3x2 + -3x2
5 + x + -3x2 = -1x + x + 3x2 + -3x2

Combine like terms: -1x + x = 0
5 + x + -3x2 = 0 + 3x2 + -3x2
5 + x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
5 + x + -3x2 = 0

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

Divide each side by '-3'.
-1.666666667 + -0.3333333333x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + -0.3333333333x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + -0.3333333333x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + -0.3333333333x + x2 = 0 + 1.666666667
-0.3333333333x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
-0.3333333333x + x2 = 1.666666667

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.
-0.3333333333x + 0.25 + x2 = 1.666666667 + 0.25

Reorder the terms:
0.25 + -0.3333333333x + x2 = 1.666666667 + 0.25

Combine like terms: 1.666666667 + 0.25 = 1.916666667
0.25 + -0.3333333333x + x2 = 1.916666667

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1.916666667

Calculate the square root of the right side: 1.384437311

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.384437311 and -1.384437311.

Subproblem 1

x + 0.5 = 1.384437311 Simplifying x + 0.5 = 1.384437311 Reorder the terms: 0.5 + x = 1.384437311 Solving 0.5 + x = 1.384437311 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 = 1.384437311 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.384437311 + -0.5 x = 1.384437311 + -0.5 Combine like terms: 1.384437311 + -0.5 = 0.884437311 x = 0.884437311 Simplifying x = 0.884437311

Subproblem 2

x + 0.5 = -1.384437311 Simplifying x + 0.5 = -1.384437311 Reorder the terms: 0.5 + x = -1.384437311 Solving 0.5 + x = -1.384437311 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 = -1.384437311 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.384437311 + -0.5 x = -1.384437311 + -0.5 Combine like terms: -1.384437311 + -0.5 = -1.884437311 x = -1.884437311 Simplifying x = -1.884437311

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.884437311, -1.884437311}

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