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Simplifying 9y2 + -81y + -1 = 0 Reorder the terms: -1 + -81y + 9y2 = 0 Solving -1 + -81y + 9y2 = 0 Solving for variable 'y'. Begin completing the square. Divide all terms by 9 the coefficient of the squared term: Divide each side by '9'. -0.1111111111 + -9y + y2 = 0 Move the constant term to the right: Add '0.1111111111' to each side of the equation. -0.1111111111 + -9y + 0.1111111111 + y2 = 0 + 0.1111111111 Reorder the terms: -0.1111111111 + 0.1111111111 + -9y + y2 = 0 + 0.1111111111 Combine like terms: -0.1111111111 + 0.1111111111 = 0.0000000000 0.0000000000 + -9y + y2 = 0 + 0.1111111111 -9y + y2 = 0 + 0.1111111111 Combine like terms: 0 + 0.1111111111 = 0.1111111111 -9y + y2 = 0.1111111111 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 = 0.1111111111 + 20.25 Reorder the terms: 20.25 + -9y + y2 = 0.1111111111 + 20.25 Combine like terms: 0.1111111111 + 20.25 = 20.3611111111 20.25 + -9y + y2 = 20.3611111111 Factor a perfect square on the left side: (y + -4.5)(y + -4.5) = 20.3611111111 Calculate the square root of the right side: 4.51232879 Break this problem into two subproblems by setting (y + -4.5) equal to 4.51232879 and -4.51232879.Subproblem 1
y + -4.5 = 4.51232879 Simplifying y + -4.5 = 4.51232879 Reorder the terms: -4.5 + y = 4.51232879 Solving -4.5 + y = 4.51232879 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 = 4.51232879 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 4.51232879 + 4.5 y = 4.51232879 + 4.5 Combine like terms: 4.51232879 + 4.5 = 9.01232879 y = 9.01232879 Simplifying y = 9.01232879Subproblem 2
y + -4.5 = -4.51232879 Simplifying y + -4.5 = -4.51232879 Reorder the terms: -4.5 + y = -4.51232879 Solving -4.5 + y = -4.51232879 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 = -4.51232879 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = -4.51232879 + 4.5 y = -4.51232879 + 4.5 Combine like terms: -4.51232879 + 4.5 = -0.01232879 y = -0.01232879 Simplifying y = -0.01232879Solution
The solution to the problem is based on the solutions from the subproblems. y = {9.01232879, -0.01232879}
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