.5y^2-4.5y+6=0

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Solution for .5y^2-4.5y+6=0 equation:


Simplifying
0.5y2 + -4.5y + 6 = 0

Reorder the terms:
6 + -4.5y + 0.5y2 = 0

Solving
6 + -4.5y + 0.5y2 = 0

Solving for variable 'y'.

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

Divide each side by '0.5'.
12 + -9y + y2 = 0

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -9y + -12 + y2 = 0 + -12

Reorder the terms:
12 + -12 + -9y + y2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -9y + y2 = 0 + -12
-9y + y2 = 0 + -12

Combine like terms: 0 + -12 = -12
-9y + y2 = -12

The y term is -9y.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9y + 20.25 + y2 = -12 + 20.25

Reorder the terms:
20.25 + -9y + y2 = -12 + 20.25

Combine like terms: -12 + 20.25 = 8.25
20.25 + -9y + y2 = 8.25

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(y + -4.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

y + -4.5 = 2.872281323 Simplifying y + -4.5 = 2.872281323 Reorder the terms: -4.5 + y = 2.872281323 Solving -4.5 + y = 2.872281323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = 2.872281323 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 2.872281323 + 4.5 y = 2.872281323 + 4.5 Combine like terms: 2.872281323 + 4.5 = 7.372281323 y = 7.372281323 Simplifying y = 7.372281323

Subproblem 2

y + -4.5 = -2.872281323 Simplifying y + -4.5 = -2.872281323 Reorder the terms: -4.5 + y = -2.872281323 Solving -4.5 + y = -2.872281323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = -2.872281323 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = -2.872281323 + 4.5 y = -2.872281323 + 4.5 Combine like terms: -2.872281323 + 4.5 = 1.627718677 y = 1.627718677 Simplifying y = 1.627718677

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.372281323, 1.627718677}

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