3x^2+x-11=0

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Solution for 3x^2+x-11=0 equation:


Simplifying
3x2 + x + -11 = 0

Reorder the terms:
-11 + x + 3x2 = 0

Solving
-11 + x + 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'.
-3.666666667 + 0.3333333333x + x2 = 0

Move the constant term to the right:

Add '3.666666667' to each side of the equation.
-3.666666667 + 0.3333333333x + 3.666666667 + x2 = 0 + 3.666666667

Reorder the terms:
-3.666666667 + 3.666666667 + 0.3333333333x + x2 = 0 + 3.666666667

Combine like terms: -3.666666667 + 3.666666667 = 0.000000000
0.000000000 + 0.3333333333x + x2 = 0 + 3.666666667
0.3333333333x + x2 = 0 + 3.666666667

Combine like terms: 0 + 3.666666667 = 3.666666667
0.3333333333x + x2 = 3.666666667

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 = 3.666666667 + 0.25

Reorder the terms:
0.25 + 0.3333333333x + x2 = 3.666666667 + 0.25

Combine like terms: 3.666666667 + 0.25 = 3.916666667
0.25 + 0.3333333333x + x2 = 3.916666667

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 3.916666667

Calculate the square root of the right side: 1.979057015

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.979057015 and -1.979057015.

Subproblem 1

x + 0.5 = 1.979057015 Simplifying x + 0.5 = 1.979057015 Reorder the terms: 0.5 + x = 1.979057015 Solving 0.5 + x = 1.979057015 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 = 1.979057015 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.979057015 + -0.5 x = 1.979057015 + -0.5 Combine like terms: 1.979057015 + -0.5 = 1.479057015 x = 1.479057015 Simplifying x = 1.479057015

Subproblem 2

x + 0.5 = -1.979057015 Simplifying x + 0.5 = -1.979057015 Reorder the terms: 0.5 + x = -1.979057015 Solving 0.5 + x = -1.979057015 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 = -1.979057015 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.979057015 + -0.5 x = -1.979057015 + -0.5 Combine like terms: -1.979057015 + -0.5 = -2.479057015 x = -2.479057015 Simplifying x = -2.479057015

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.479057015, -2.479057015}

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