0=3x^2-2x-15

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


Simplifying
0 = 3x2 + -2x + -15

Reorder the terms:
0 = -15 + -2x + 3x2

Solving
0 = -15 + -2x + 3x2

Solving for variable 'x'.

Combine like terms: 0 + 15 = 15
15 + 2x + -3x2 = -15 + -2x + 3x2 + 15 + 2x + -3x2

Reorder the terms:
15 + 2x + -3x2 = -15 + 15 + -2x + 2x + 3x2 + -3x2

Combine like terms: -15 + 15 = 0
15 + 2x + -3x2 = 0 + -2x + 2x + 3x2 + -3x2
15 + 2x + -3x2 = -2x + 2x + 3x2 + -3x2

Combine like terms: -2x + 2x = 0
15 + 2x + -3x2 = 0 + 3x2 + -3x2
15 + 2x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
15 + 2x + -3x2 = 0

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

Divide each side by '-3'.
-5 + -0.6666666667x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -0.6666666667x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -0.6666666667x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -0.6666666667x + x2 = 0 + 5
-0.6666666667x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-0.6666666667x + x2 = 5

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 = 5 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667x + x2 = 5 + 0.1111111112

Combine like terms: 5 + 0.1111111112 = 5.1111111112
0.1111111112 + -0.6666666667x + x2 = 5.1111111112

Factor a perfect square on the left side:
(x + -0.3333333334)(x + -0.3333333334) = 5.1111111112

Calculate the square root of the right side: 2.260776661

Break this problem into two subproblems by setting 
(x + -0.3333333334) equal to 2.260776661 and -2.260776661.

Subproblem 1

x + -0.3333333334 = 2.260776661 Simplifying x + -0.3333333334 = 2.260776661 Reorder the terms: -0.3333333334 + x = 2.260776661 Solving -0.3333333334 + x = 2.260776661 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 = 2.260776661 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = 2.260776661 + 0.3333333334 x = 2.260776661 + 0.3333333334 Combine like terms: 2.260776661 + 0.3333333334 = 2.5941099944 x = 2.5941099944 Simplifying x = 2.5941099944

Subproblem 2

x + -0.3333333334 = -2.260776661 Simplifying x + -0.3333333334 = -2.260776661 Reorder the terms: -0.3333333334 + x = -2.260776661 Solving -0.3333333334 + x = -2.260776661 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 = -2.260776661 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = -2.260776661 + 0.3333333334 x = -2.260776661 + 0.3333333334 Combine like terms: -2.260776661 + 0.3333333334 = -1.9274433276 x = -1.9274433276 Simplifying x = -1.9274433276

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.5941099944, -1.9274433276}

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