3x^2-2x-165=0

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Solution for 3x^2-2x-165=0 equation:


Simplifying
3x2 + -2x + -165 = 0

Reorder the terms:
-165 + -2x + 3x2 = 0

Solving
-165 + -2x + 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'.
-55 + -0.6666666667x + x2 = 0

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + -0.6666666667x + 55 + x2 = 0 + 55

Reorder the terms:
-55 + 55 + -0.6666666667x + x2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + -0.6666666667x + x2 = 0 + 55
-0.6666666667x + x2 = 0 + 55

Combine like terms: 0 + 55 = 55
-0.6666666667x + x2 = 55

The x term is -0.6666666667x.  Take half its coefficient (-0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
-0.6666666667x + 0.1111111112 + x2 = 55 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667x + x2 = 55 + 0.1111111112

Combine like terms: 55 + 0.1111111112 = 55.1111111112
0.1111111112 + -0.6666666667x + x2 = 55.1111111112

Factor a perfect square on the left side:
(x + -0.3333333334)(x + -0.3333333334) = 55.1111111112

Calculate the square root of the right side: 7.423685817

Break this problem into two subproblems by setting 
(x + -0.3333333334) equal to 7.423685817 and -7.423685817.

Subproblem 1

x + -0.3333333334 = 7.423685817 Simplifying x + -0.3333333334 = 7.423685817 Reorder the terms: -0.3333333334 + x = 7.423685817 Solving -0.3333333334 + x = 7.423685817 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = 7.423685817 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = 7.423685817 + 0.3333333334 x = 7.423685817 + 0.3333333334 Combine like terms: 7.423685817 + 0.3333333334 = 7.7570191504 x = 7.7570191504 Simplifying x = 7.7570191504

Subproblem 2

x + -0.3333333334 = -7.423685817 Simplifying x + -0.3333333334 = -7.423685817 Reorder the terms: -0.3333333334 + x = -7.423685817 Solving -0.3333333334 + x = -7.423685817 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = -7.423685817 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = -7.423685817 + 0.3333333334 x = -7.423685817 + 0.3333333334 Combine like terms: -7.423685817 + 0.3333333334 = -7.0903524836 x = -7.0903524836 Simplifying x = -7.0903524836

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.7570191504, -7.0903524836}

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