2y(5y-1)=13

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Solution for 2y(5y-1)=13 equation:


Simplifying
2y(5y + -1) = 13

Reorder the terms:
2y(-1 + 5y) = 13
(-1 * 2y + 5y * 2y) = 13
(-2y + 10y2) = 13

Solving
-2y + 10y2 = 13

Solving for variable 'y'.

Reorder the terms:
-13 + -2y + 10y2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + -2y + 10y2 = 0

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

Divide each side by '10'.
-1.3 + -0.2y + y2 = 0.0

Move the constant term to the right:

Add '1.3' to each side of the equation.
-1.3 + -0.2y + 1.3 + y2 = 0.0 + 1.3

Reorder the terms:
-1.3 + 1.3 + -0.2y + y2 = 0.0 + 1.3

Combine like terms: -1.3 + 1.3 = 0.0
0.0 + -0.2y + y2 = 0.0 + 1.3
-0.2y + y2 = 0.0 + 1.3

Combine like terms: 0.0 + 1.3 = 1.3
-0.2y + y2 = 1.3

The y term is -0.2y.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2y + 0.01 + y2 = 1.3 + 0.01

Reorder the terms:
0.01 + -0.2y + y2 = 1.3 + 0.01

Combine like terms: 1.3 + 0.01 = 1.31
0.01 + -0.2y + y2 = 1.31

Factor a perfect square on the left side:
(y + -0.1)(y + -0.1) = 1.31

Calculate the square root of the right side: 1.144552314

Break this problem into two subproblems by setting 
(y + -0.1) equal to 1.144552314 and -1.144552314.

Subproblem 1

y + -0.1 = 1.144552314 Simplifying y + -0.1 = 1.144552314 Reorder the terms: -0.1 + y = 1.144552314 Solving -0.1 + y = 1.144552314 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + y = 1.144552314 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + y = 1.144552314 + 0.1 y = 1.144552314 + 0.1 Combine like terms: 1.144552314 + 0.1 = 1.244552314 y = 1.244552314 Simplifying y = 1.244552314

Subproblem 2

y + -0.1 = -1.144552314 Simplifying y + -0.1 = -1.144552314 Reorder the terms: -0.1 + y = -1.144552314 Solving -0.1 + y = -1.144552314 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + y = -1.144552314 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + y = -1.144552314 + 0.1 y = -1.144552314 + 0.1 Combine like terms: -1.144552314 + 0.1 = -1.044552314 y = -1.044552314 Simplifying y = -1.044552314

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.244552314, -1.044552314}

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