-4.5y+y^2=9

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Solution for -4.5y+y^2=9 equation:


Simplifying
-4.5y + y2 = 9

Solving
-4.5y + y2 = 9

Solving for variable 'y'.

Reorder the terms:
-9 + -4.5y + y2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -4.5y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -4.5y + 9 + y2 = 0 + 9

Reorder the terms:
-9 + 9 + -4.5y + y2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -4.5y + y2 = 0 + 9
-4.5y + y2 = 0 + 9

Combine like terms: 0 + 9 = 9
-4.5y + y2 = 9

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 = 9 + 5.0625

Reorder the terms:
5.0625 + -4.5y + y2 = 9 + 5.0625

Combine like terms: 9 + 5.0625 = 14.0625
5.0625 + -4.5y + y2 = 14.0625

Factor a perfect square on the left side:
(y + -2.25)(y + -2.25) = 14.0625

Calculate the square root of the right side: 3.75

Break this problem into two subproblems by setting 
(y + -2.25) equal to 3.75 and -3.75.

Subproblem 1

y + -2.25 = 3.75 Simplifying y + -2.25 = 3.75 Reorder the terms: -2.25 + y = 3.75 Solving -2.25 + y = 3.75 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 = 3.75 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y = 3.75 + 2.25 y = 3.75 + 2.25 Combine like terms: 3.75 + 2.25 = 6 y = 6 Simplifying y = 6

Subproblem 2

y + -2.25 = -3.75 Simplifying y + -2.25 = -3.75 Reorder the terms: -2.25 + y = -3.75 Solving -2.25 + y = -3.75 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 = -3.75 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y = -3.75 + 2.25 y = -3.75 + 2.25 Combine like terms: -3.75 + 2.25 = -1.5 y = -1.5 Simplifying y = -1.5

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6, -1.5}

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