2y^2-9y+5=0

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Solution for 2y^2-9y+5=0 equation:


Simplifying
2y2 + -9y + 5 = 0

Reorder the terms:
5 + -9y + 2y2 = 0

Solving
5 + -9y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
2.5 + -4.5y + y2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + -4.5y + -2.5 + y2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + -4.5y + y2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -4.5y + y2 = 0 + -2.5
-4.5y + y2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
-4.5y + y2 = -2.5

The y term is -4.5y.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5y + 5.0625 + y2 = -2.5 + 5.0625

Reorder the terms:
5.0625 + -4.5y + y2 = -2.5 + 5.0625

Combine like terms: -2.5 + 5.0625 = 2.5625
5.0625 + -4.5y + y2 = 2.5625

Factor a perfect square on the left side:
(y + -2.25)(y + -2.25) = 2.5625

Calculate the square root of the right side: 1.600781059

Break this problem into two subproblems by setting 
(y + -2.25) equal to 1.600781059 and -1.600781059.

Subproblem 1

y + -2.25 = 1.600781059 Simplifying y + -2.25 = 1.600781059 Reorder the terms: -2.25 + y = 1.600781059 Solving -2.25 + y = 1.600781059 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + y = 1.600781059 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y = 1.600781059 + 2.25 y = 1.600781059 + 2.25 Combine like terms: 1.600781059 + 2.25 = 3.850781059 y = 3.850781059 Simplifying y = 3.850781059

Subproblem 2

y + -2.25 = -1.600781059 Simplifying y + -2.25 = -1.600781059 Reorder the terms: -2.25 + y = -1.600781059 Solving -2.25 + y = -1.600781059 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + y = -1.600781059 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y = -1.600781059 + 2.25 y = -1.600781059 + 2.25 Combine like terms: -1.600781059 + 2.25 = 0.649218941 y = 0.649218941 Simplifying y = 0.649218941

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.850781059, 0.649218941}

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