10y^2-65y-132=0

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Solution for 10y^2-65y-132=0 equation:


Simplifying
10y2 + -65y + -132 = 0

Reorder the terms:
-132 + -65y + 10y2 = 0

Solving
-132 + -65y + 10y2 = 0

Solving for variable 'y'.

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

Divide each side by '10'.
-13.2 + -6.5y + y2 = 0

Move the constant term to the right:

Add '13.2' to each side of the equation.
-13.2 + -6.5y + 13.2 + y2 = 0 + 13.2

Reorder the terms:
-13.2 + 13.2 + -6.5y + y2 = 0 + 13.2

Combine like terms: -13.2 + 13.2 = 0.0
0.0 + -6.5y + y2 = 0 + 13.2
-6.5y + y2 = 0 + 13.2

Combine like terms: 0 + 13.2 = 13.2
-6.5y + y2 = 13.2

The y term is -6.5y.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5y + 10.5625 + y2 = 13.2 + 10.5625

Reorder the terms:
10.5625 + -6.5y + y2 = 13.2 + 10.5625

Combine like terms: 13.2 + 10.5625 = 23.7625
10.5625 + -6.5y + y2 = 23.7625

Factor a perfect square on the left side:
(y + -3.25)(y + -3.25) = 23.7625

Calculate the square root of the right side: 4.874679477

Break this problem into two subproblems by setting 
(y + -3.25) equal to 4.874679477 and -4.874679477.

Subproblem 1

y + -3.25 = 4.874679477 Simplifying y + -3.25 = 4.874679477 Reorder the terms: -3.25 + y = 4.874679477 Solving -3.25 + y = 4.874679477 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + y = 4.874679477 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + y = 4.874679477 + 3.25 y = 4.874679477 + 3.25 Combine like terms: 4.874679477 + 3.25 = 8.124679477 y = 8.124679477 Simplifying y = 8.124679477

Subproblem 2

y + -3.25 = -4.874679477 Simplifying y + -3.25 = -4.874679477 Reorder the terms: -3.25 + y = -4.874679477 Solving -3.25 + y = -4.874679477 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + y = -4.874679477 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + y = -4.874679477 + 3.25 y = -4.874679477 + 3.25 Combine like terms: -4.874679477 + 3.25 = -1.624679477 y = -1.624679477 Simplifying y = -1.624679477

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.124679477, -1.624679477}

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