5y^2-16y-15=0

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Solution for 5y^2-16y-15=0 equation:


Simplifying
5y2 + -16y + -15 = 0

Reorder the terms:
-15 + -16y + 5y2 = 0

Solving
-15 + -16y + 5y2 = 0

Solving for variable 'y'.

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

Divide each side by '5'.
-3 + -3.2y + y2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -3.2y + 3 + y2 = 0 + 3

Reorder the terms:
-3 + 3 + -3.2y + y2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -3.2y + y2 = 0 + 3
-3.2y + y2 = 0 + 3

Combine like terms: 0 + 3 = 3
-3.2y + y2 = 3

The y term is -3.2y.  Take half its coefficient (-1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
-3.2y + 2.56 + y2 = 3 + 2.56

Reorder the terms:
2.56 + -3.2y + y2 = 3 + 2.56

Combine like terms: 3 + 2.56 = 5.56
2.56 + -3.2y + y2 = 5.56

Factor a perfect square on the left side:
(y + -1.6)(y + -1.6) = 5.56

Calculate the square root of the right side: 2.357965225

Break this problem into two subproblems by setting 
(y + -1.6) equal to 2.357965225 and -2.357965225.

Subproblem 1

y + -1.6 = 2.357965225 Simplifying y + -1.6 = 2.357965225 Reorder the terms: -1.6 + y = 2.357965225 Solving -1.6 + y = 2.357965225 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + y = 2.357965225 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + y = 2.357965225 + 1.6 y = 2.357965225 + 1.6 Combine like terms: 2.357965225 + 1.6 = 3.957965225 y = 3.957965225 Simplifying y = 3.957965225

Subproblem 2

y + -1.6 = -2.357965225 Simplifying y + -1.6 = -2.357965225 Reorder the terms: -1.6 + y = -2.357965225 Solving -1.6 + y = -2.357965225 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + y = -2.357965225 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + y = -2.357965225 + 1.6 y = -2.357965225 + 1.6 Combine like terms: -2.357965225 + 1.6 = -0.757965225 y = -0.757965225 Simplifying y = -0.757965225

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.957965225, -0.757965225}

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