5y^2-8y-11=0

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Solution for 5y^2-8y-11=0 equation:


Simplifying
5y2 + -8y + -11 = 0

Reorder the terms:
-11 + -8y + 5y2 = 0

Solving
-11 + -8y + 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'.
-2.2 + -1.6y + y2 = 0

Move the constant term to the right:

Add '2.2' to each side of the equation.
-2.2 + -1.6y + 2.2 + y2 = 0 + 2.2

Reorder the terms:
-2.2 + 2.2 + -1.6y + y2 = 0 + 2.2

Combine like terms: -2.2 + 2.2 = 0.0
0.0 + -1.6y + y2 = 0 + 2.2
-1.6y + y2 = 0 + 2.2

Combine like terms: 0 + 2.2 = 2.2
-1.6y + y2 = 2.2

The y term is -1.6y.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6y + 0.64 + y2 = 2.2 + 0.64

Reorder the terms:
0.64 + -1.6y + y2 = 2.2 + 0.64

Combine like terms: 2.2 + 0.64 = 2.84
0.64 + -1.6y + y2 = 2.84

Factor a perfect square on the left side:
(y + -0.8)(y + -0.8) = 2.84

Calculate the square root of the right side: 1.685229955

Break this problem into two subproblems by setting 
(y + -0.8) equal to 1.685229955 and -1.685229955.

Subproblem 1

y + -0.8 = 1.685229955 Simplifying y + -0.8 = 1.685229955 Reorder the terms: -0.8 + y = 1.685229955 Solving -0.8 + y = 1.685229955 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + y = 1.685229955 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + y = 1.685229955 + 0.8 y = 1.685229955 + 0.8 Combine like terms: 1.685229955 + 0.8 = 2.485229955 y = 2.485229955 Simplifying y = 2.485229955

Subproblem 2

y + -0.8 = -1.685229955 Simplifying y + -0.8 = -1.685229955 Reorder the terms: -0.8 + y = -1.685229955 Solving -0.8 + y = -1.685229955 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + y = -1.685229955 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + y = -1.685229955 + 0.8 y = -1.685229955 + 0.8 Combine like terms: -1.685229955 + 0.8 = -0.885229955 y = -0.885229955 Simplifying y = -0.885229955

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.485229955, -0.885229955}

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