y^2-9y=-20.25

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Solution for y^2-9y=-20.25 equation:


Simplifying
y2 + -9y = -20.25

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

Solving
-9y + y2 = -20.25

Solving for variable 'y'.

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

Combine like terms: -20.25 + 20.25 = 0.00
20.25 + -9y + y2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '-20.25' to each side of the equation.
20.25 + -9y + -20.25 + y2 = 0.00 + -20.25

Reorder the terms:
20.25 + -20.25 + -9y + y2 = 0.00 + -20.25

Combine like terms: 20.25 + -20.25 = 0.00
0.00 + -9y + y2 = 0.00 + -20.25
-9y + y2 = 0.00 + -20.25

Combine like terms: 0.00 + -20.25 = -20.25
-9y + y2 = -20.25

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 = -20.25 + 20.25

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

Combine like terms: -20.25 + 20.25 = 0.00
20.25 + -9y + y2 = 0.00

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = 0.00

Calculate the square root of the right side: 0.00

Break this problem into two subproblems by setting 
(y + -4.5) equal to 0.00 and 0.00.

Subproblem 1

y + -4.5 = 0.00 Simplifying y + -4.5 = 0.00 Reorder the terms: -4.5 + y = 0.00 Solving -4.5 + y = 0.00 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 = 0.00 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 0.00 + 4.5 y = 0.00 + 4.5 Combine like terms: 0.00 + 4.5 = 4.5 y = 4.5 Simplifying y = 4.5

Subproblem 2

y + -4.5 = 0.00 Simplifying y + -4.5 = 0.00 Reorder the terms: -4.5 + y = 0.00 Solving -4.5 + y = 0.00 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 = 0.00 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 0.00 + 4.5 y = 0.00 + 4.5 Combine like terms: 0.00 + 4.5 = 4.5 y = 4.5 Simplifying y = 4.5

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.5, 4.5}

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