(3x^2)+2x-15=0

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


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

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

Solving
-15 + 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'.
-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 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

Subproblem 2

(x) + 0.3333333334 = -2.260776661 Simplifying (x) + 0.3333333334 = -2.260776661 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

Solution

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

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