2y(5y-2)=15y+6

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Solution for 2y(5y-2)=15y+6 equation:


Simplifying
2y(5y + -2) = 15y + 6

Reorder the terms:
2y(-2 + 5y) = 15y + 6
(-2 * 2y + 5y * 2y) = 15y + 6
(-4y + 10y2) = 15y + 6

Reorder the terms:
-4y + 10y2 = 6 + 15y

Solving
-4y + 10y2 = 6 + 15y

Solving for variable 'y'.

Reorder the terms:
-6 + -4y + -15y + 10y2 = 6 + 15y + -6 + -15y

Combine like terms: -4y + -15y = -19y
-6 + -19y + 10y2 = 6 + 15y + -6 + -15y

Reorder the terms:
-6 + -19y + 10y2 = 6 + -6 + 15y + -15y

Combine like terms: 6 + -6 = 0
-6 + -19y + 10y2 = 0 + 15y + -15y
-6 + -19y + 10y2 = 15y + -15y

Combine like terms: 15y + -15y = 0
-6 + -19y + 10y2 = 0

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

Divide each side by '10'.
-0.6 + -1.9y + y2 = 0.0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -1.9y + 0.6 + y2 = 0.0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -1.9y + y2 = 0.0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -1.9y + y2 = 0.0 + 0.6
-1.9y + y2 = 0.0 + 0.6

Combine like terms: 0.0 + 0.6 = 0.6
-1.9y + y2 = 0.6

The y term is -1.9y.  Take half its coefficient (-0.95).
Square it (0.9025) and add it to both sides.

Add '0.9025' to each side of the equation.
-1.9y + 0.9025 + y2 = 0.6 + 0.9025

Reorder the terms:
0.9025 + -1.9y + y2 = 0.6 + 0.9025

Combine like terms: 0.6 + 0.9025 = 1.5025
0.9025 + -1.9y + y2 = 1.5025

Factor a perfect square on the left side:
(y + -0.95)(y + -0.95) = 1.5025

Calculate the square root of the right side: 1.225765067

Break this problem into two subproblems by setting 
(y + -0.95) equal to 1.225765067 and -1.225765067.

Subproblem 1

y + -0.95 = 1.225765067 Simplifying y + -0.95 = 1.225765067 Reorder the terms: -0.95 + y = 1.225765067 Solving -0.95 + y = 1.225765067 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.95' to each side of the equation. -0.95 + 0.95 + y = 1.225765067 + 0.95 Combine like terms: -0.95 + 0.95 = 0.00 0.00 + y = 1.225765067 + 0.95 y = 1.225765067 + 0.95 Combine like terms: 1.225765067 + 0.95 = 2.175765067 y = 2.175765067 Simplifying y = 2.175765067

Subproblem 2

y + -0.95 = -1.225765067 Simplifying y + -0.95 = -1.225765067 Reorder the terms: -0.95 + y = -1.225765067 Solving -0.95 + y = -1.225765067 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.95' to each side of the equation. -0.95 + 0.95 + y = -1.225765067 + 0.95 Combine like terms: -0.95 + 0.95 = 0.00 0.00 + y = -1.225765067 + 0.95 y = -1.225765067 + 0.95 Combine like terms: -1.225765067 + 0.95 = -0.275765067 y = -0.275765067 Simplifying y = -0.275765067

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.175765067, -0.275765067}

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