3(x^2)-15x-14=0

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Solution for 3(x^2)-15x-14=0 equation:


Simplifying
3(x2) + -15x + -14 = 0

Reorder the terms:
-14 + -15x + 3x2 = 0

Solving
-14 + -15x + 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'.
-4.666666667 + -5x + x2 = 0

Move the constant term to the right:

Add '4.666666667' to each side of the equation.
-4.666666667 + -5x + 4.666666667 + x2 = 0 + 4.666666667

Reorder the terms:
-4.666666667 + 4.666666667 + -5x + x2 = 0 + 4.666666667

Combine like terms: -4.666666667 + 4.666666667 = 0.000000000
0.000000000 + -5x + x2 = 0 + 4.666666667
-5x + x2 = 0 + 4.666666667

Combine like terms: 0 + 4.666666667 = 4.666666667
-5x + x2 = 4.666666667

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 = 4.666666667 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 4.666666667 + 6.25

Combine like terms: 4.666666667 + 6.25 = 10.916666667
6.25 + -5x + x2 = 10.916666667

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 10.916666667

Calculate the square root of the right side: 3.304037934

Break this problem into two subproblems by setting 
(x + -2.5) equal to 3.304037934 and -3.304037934.

Subproblem 1

x + -2.5 = 3.304037934 Simplifying x + -2.5 = 3.304037934 Reorder the terms: -2.5 + x = 3.304037934 Solving -2.5 + x = 3.304037934 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 = 3.304037934 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 3.304037934 + 2.5 x = 3.304037934 + 2.5 Combine like terms: 3.304037934 + 2.5 = 5.804037934 x = 5.804037934 Simplifying x = 5.804037934

Subproblem 2

x + -2.5 = -3.304037934 Simplifying x + -2.5 = -3.304037934 Reorder the terms: -2.5 + x = -3.304037934 Solving -2.5 + x = -3.304037934 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 = -3.304037934 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -3.304037934 + 2.5 x = -3.304037934 + 2.5 Combine like terms: -3.304037934 + 2.5 = -0.804037934 x = -0.804037934 Simplifying x = -0.804037934

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.804037934, -0.804037934}

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