8y^2-20y+9=0

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Solution for 8y^2-20y+9=0 equation:


Simplifying
8y2 + -20y + 9 = 0

Reorder the terms:
9 + -20y + 8y2 = 0

Solving
9 + -20y + 8y2 = 0

Solving for variable 'y'.

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

Divide each side by '8'.
1.125 + -2.5y + y2 = 0

Move the constant term to the right:

Add '-1.125' to each side of the equation.
1.125 + -2.5y + -1.125 + y2 = 0 + -1.125

Reorder the terms:
1.125 + -1.125 + -2.5y + y2 = 0 + -1.125

Combine like terms: 1.125 + -1.125 = 0.000
0.000 + -2.5y + y2 = 0 + -1.125
-2.5y + y2 = 0 + -1.125

Combine like terms: 0 + -1.125 = -1.125
-2.5y + y2 = -1.125

The y term is -2.5y.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5y + 1.5625 + y2 = -1.125 + 1.5625

Reorder the terms:
1.5625 + -2.5y + y2 = -1.125 + 1.5625

Combine like terms: -1.125 + 1.5625 = 0.4375
1.5625 + -2.5y + y2 = 0.4375

Factor a perfect square on the left side:
(y + -1.25)(y + -1.25) = 0.4375

Calculate the square root of the right side: 0.661437828

Break this problem into two subproblems by setting 
(y + -1.25) equal to 0.661437828 and -0.661437828.

Subproblem 1

y + -1.25 = 0.661437828 Simplifying y + -1.25 = 0.661437828 Reorder the terms: -1.25 + y = 0.661437828 Solving -1.25 + y = 0.661437828 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + y = 0.661437828 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + y = 0.661437828 + 1.25 y = 0.661437828 + 1.25 Combine like terms: 0.661437828 + 1.25 = 1.911437828 y = 1.911437828 Simplifying y = 1.911437828

Subproblem 2

y + -1.25 = -0.661437828 Simplifying y + -1.25 = -0.661437828 Reorder the terms: -1.25 + y = -0.661437828 Solving -1.25 + y = -0.661437828 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + y = -0.661437828 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + y = -0.661437828 + 1.25 y = -0.661437828 + 1.25 Combine like terms: -0.661437828 + 1.25 = 0.588562172 y = 0.588562172 Simplifying y = 0.588562172

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.911437828, 0.588562172}

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