0=3x^2-15x-11

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Solution for 0=3x^2-15x-11 equation:


Simplifying
0 = 3x2 + -15x + -11

Reorder the terms:
0 = -11 + -15x + 3x2

Solving
0 = -11 + -15x + 3x2

Solving for variable 'x'.

Combine like terms: 0 + 11 = 11
11 + 15x + -3x2 = -11 + -15x + 3x2 + 11 + 15x + -3x2

Reorder the terms:
11 + 15x + -3x2 = -11 + 11 + -15x + 15x + 3x2 + -3x2

Combine like terms: -11 + 11 = 0
11 + 15x + -3x2 = 0 + -15x + 15x + 3x2 + -3x2
11 + 15x + -3x2 = -15x + 15x + 3x2 + -3x2

Combine like terms: -15x + 15x = 0
11 + 15x + -3x2 = 0 + 3x2 + -3x2
11 + 15x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
11 + 15x + -3x2 = 0

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

Divide each side by '-3'.
-3.666666667 + -5x + x2 = 0

Move the constant term to the right:

Add '3.666666667' to each side of the equation.
-3.666666667 + -5x + 3.666666667 + x2 = 0 + 3.666666667

Reorder the terms:
-3.666666667 + 3.666666667 + -5x + x2 = 0 + 3.666666667

Combine like terms: -3.666666667 + 3.666666667 = 0.000000000
0.000000000 + -5x + x2 = 0 + 3.666666667
-5x + x2 = 0 + 3.666666667

Combine like terms: 0 + 3.666666667 = 3.666666667
-5x + x2 = 3.666666667

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 3.666666667 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 3.666666667 + 6.25

Combine like terms: 3.666666667 + 6.25 = 9.916666667
6.25 + -5x + x2 = 9.916666667

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 9.916666667

Calculate the square root of the right side: 3.149073938

Break this problem into two subproblems by setting 
(x + -2.5) equal to 3.149073938 and -3.149073938.

Subproblem 1

x + -2.5 = 3.149073938 Simplifying x + -2.5 = 3.149073938 Reorder the terms: -2.5 + x = 3.149073938 Solving -2.5 + x = 3.149073938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 3.149073938 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 3.149073938 + 2.5 x = 3.149073938 + 2.5 Combine like terms: 3.149073938 + 2.5 = 5.649073938 x = 5.649073938 Simplifying x = 5.649073938

Subproblem 2

x + -2.5 = -3.149073938 Simplifying x + -2.5 = -3.149073938 Reorder the terms: -2.5 + x = -3.149073938 Solving -2.5 + x = -3.149073938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -3.149073938 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -3.149073938 + 2.5 x = -3.149073938 + 2.5 Combine like terms: -3.149073938 + 2.5 = -0.649073938 x = -0.649073938 Simplifying x = -0.649073938

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.649073938, -0.649073938}

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