15x(3x-5)=-2

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Solution for 15x(3x-5)=-2 equation:


Simplifying
15x(3x + -5) = -2

Reorder the terms:
15x(-5 + 3x) = -2
(-5 * 15x + 3x * 15x) = -2
(-75x + 45x2) = -2

Solving
-75x + 45x2 = -2

Solving for variable 'x'.

Reorder the terms:
2 + -75x + 45x2 = -2 + 2

Combine like terms: -2 + 2 = 0
2 + -75x + 45x2 = 0

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

Divide each side by '45'.
0.04444444444 + -1.666666667x + x2 = 0

Move the constant term to the right:

Add '-0.04444444444' to each side of the equation.
0.04444444444 + -1.666666667x + -0.04444444444 + x2 = 0 + -0.04444444444

Reorder the terms:
0.04444444444 + -0.04444444444 + -1.666666667x + x2 = 0 + -0.04444444444

Combine like terms: 0.04444444444 + -0.04444444444 = 0.00000000000
0.00000000000 + -1.666666667x + x2 = 0 + -0.04444444444
-1.666666667x + x2 = 0 + -0.04444444444

Combine like terms: 0 + -0.04444444444 = -0.04444444444
-1.666666667x + x2 = -0.04444444444

The x term is -1.666666667x.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667x + 0.6944444447 + x2 = -0.04444444444 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667x + x2 = -0.04444444444 + 0.6944444447

Combine like terms: -0.04444444444 + 0.6944444447 = 0.65000000026
0.6944444447 + -1.666666667x + x2 = 0.65000000026

Factor a perfect square on the left side:
(x + -0.8333333335)(x + -0.8333333335) = 0.65000000026

Calculate the square root of the right side: 0.806225775

Break this problem into two subproblems by setting 
(x + -0.8333333335) equal to 0.806225775 and -0.806225775.

Subproblem 1

x + -0.8333333335 = 0.806225775 Simplifying x + -0.8333333335 = 0.806225775 Reorder the terms: -0.8333333335 + x = 0.806225775 Solving -0.8333333335 + x = 0.806225775 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = 0.806225775 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = 0.806225775 + 0.8333333335 x = 0.806225775 + 0.8333333335 Combine like terms: 0.806225775 + 0.8333333335 = 1.6395591085 x = 1.6395591085 Simplifying x = 1.6395591085

Subproblem 2

x + -0.8333333335 = -0.806225775 Simplifying x + -0.8333333335 = -0.806225775 Reorder the terms: -0.8333333335 + x = -0.806225775 Solving -0.8333333335 + x = -0.806225775 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = -0.806225775 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = -0.806225775 + 0.8333333335 x = -0.806225775 + 0.8333333335 Combine like terms: -0.806225775 + 0.8333333335 = 0.0271075585 x = 0.0271075585 Simplifying x = 0.0271075585

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.6395591085, 0.0271075585}

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