8(y^2-9)+2y=5y-1

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Solution for 8(y^2-9)+2y=5y-1 equation:


Simplifying
8(y2 + -9) + 2y = 5y + -1

Reorder the terms:
8(-9 + y2) + 2y = 5y + -1
(-9 * 8 + y2 * 8) + 2y = 5y + -1
(-72 + 8y2) + 2y = 5y + -1

Reorder the terms:
-72 + 2y + 8y2 = 5y + -1

Reorder the terms:
-72 + 2y + 8y2 = -1 + 5y

Solving
-72 + 2y + 8y2 = -1 + 5y

Solving for variable 'y'.

Reorder the terms:
-72 + 1 + 2y + -5y + 8y2 = -1 + 5y + 1 + -5y

Combine like terms: -72 + 1 = -71
-71 + 2y + -5y + 8y2 = -1 + 5y + 1 + -5y

Combine like terms: 2y + -5y = -3y
-71 + -3y + 8y2 = -1 + 5y + 1 + -5y

Reorder the terms:
-71 + -3y + 8y2 = -1 + 1 + 5y + -5y

Combine like terms: -1 + 1 = 0
-71 + -3y + 8y2 = 0 + 5y + -5y
-71 + -3y + 8y2 = 5y + -5y

Combine like terms: 5y + -5y = 0
-71 + -3y + 8y2 = 0

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

Divide each side by '8'.
-8.875 + -0.375y + y2 = 0

Move the constant term to the right:

Add '8.875' to each side of the equation.
-8.875 + -0.375y + 8.875 + y2 = 0 + 8.875

Reorder the terms:
-8.875 + 8.875 + -0.375y + y2 = 0 + 8.875

Combine like terms: -8.875 + 8.875 = 0.000
0.000 + -0.375y + y2 = 0 + 8.875
-0.375y + y2 = 0 + 8.875

Combine like terms: 0 + 8.875 = 8.875
-0.375y + y2 = 8.875

The y term is -0.375y.  Take half its coefficient (-0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
-0.375y + 0.03515625 + y2 = 8.875 + 0.03515625

Reorder the terms:
0.03515625 + -0.375y + y2 = 8.875 + 0.03515625

Combine like terms: 8.875 + 0.03515625 = 8.91015625
0.03515625 + -0.375y + y2 = 8.91015625

Factor a perfect square on the left side:
(y + -0.1875)(y + -0.1875) = 8.91015625

Calculate the square root of the right side: 2.984988484

Break this problem into two subproblems by setting 
(y + -0.1875) equal to 2.984988484 and -2.984988484.

Subproblem 1

y + -0.1875 = 2.984988484 Simplifying y + -0.1875 = 2.984988484 Reorder the terms: -0.1875 + y = 2.984988484 Solving -0.1875 + y = 2.984988484 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + y = 2.984988484 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + y = 2.984988484 + 0.1875 y = 2.984988484 + 0.1875 Combine like terms: 2.984988484 + 0.1875 = 3.172488484 y = 3.172488484 Simplifying y = 3.172488484

Subproblem 2

y + -0.1875 = -2.984988484 Simplifying y + -0.1875 = -2.984988484 Reorder the terms: -0.1875 + y = -2.984988484 Solving -0.1875 + y = -2.984988484 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + y = -2.984988484 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + y = -2.984988484 + 0.1875 y = -2.984988484 + 0.1875 Combine like terms: -2.984988484 + 0.1875 = -2.797488484 y = -2.797488484 Simplifying y = -2.797488484

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.172488484, -2.797488484}

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