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