y^2-6.5y-10=0

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Solution for y^2-6.5y-10=0 equation:


Simplifying
y2 + -6.5y + -10 = 0

Reorder the terms:
-10 + -6.5y + y2 = 0

Solving
-10 + -6.5y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -6.5y + 10 + y2 = 0 + 10

Reorder the terms:
-10 + 10 + -6.5y + y2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -6.5y + y2 = 0 + 10
-6.5y + y2 = 0 + 10

Combine like terms: 0 + 10 = 10
-6.5y + y2 = 10

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 = 10 + 10.5625

Reorder the terms:
10.5625 + -6.5y + y2 = 10 + 10.5625

Combine like terms: 10 + 10.5625 = 20.5625
10.5625 + -6.5y + y2 = 20.5625

Factor a perfect square on the left side:
(y + -3.25)(y + -3.25) = 20.5625

Calculate the square root of the right side: 4.534589287

Break this problem into two subproblems by setting 
(y + -3.25) equal to 4.534589287 and -4.534589287.

Subproblem 1

y + -3.25 = 4.534589287 Simplifying y + -3.25 = 4.534589287 Reorder the terms: -3.25 + y = 4.534589287 Solving -3.25 + y = 4.534589287 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 = 4.534589287 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + y = 4.534589287 + 3.25 y = 4.534589287 + 3.25 Combine like terms: 4.534589287 + 3.25 = 7.784589287 y = 7.784589287 Simplifying y = 7.784589287

Subproblem 2

y + -3.25 = -4.534589287 Simplifying y + -3.25 = -4.534589287 Reorder the terms: -3.25 + y = -4.534589287 Solving -3.25 + y = -4.534589287 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 = -4.534589287 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + y = -4.534589287 + 3.25 y = -4.534589287 + 3.25 Combine like terms: -4.534589287 + 3.25 = -1.284589287 y = -1.284589287 Simplifying y = -1.284589287

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.784589287, -1.284589287}

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