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Simplifying 2y2 + y + -1 = 15 Reorder the terms: -1 + y + 2y2 = 15 Solving -1 + y + 2y2 = 15 Solving for variable 'y'. Reorder the terms: -1 + -15 + y + 2y2 = 15 + -15 Combine like terms: -1 + -15 = -16 -16 + y + 2y2 = 15 + -15 Combine like terms: 15 + -15 = 0 -16 + y + 2y2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -8 + 0.5y + y2 = 0 Move the constant term to the right: Add '8' to each side of the equation. -8 + 0.5y + 8 + y2 = 0 + 8 Reorder the terms: -8 + 8 + 0.5y + y2 = 0 + 8 Combine like terms: -8 + 8 = 0 0 + 0.5y + y2 = 0 + 8 0.5y + y2 = 0 + 8 Combine like terms: 0 + 8 = 8 0.5y + y2 = 8 The y term is y. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. 0.5y + 0.25 + y2 = 8 + 0.25 Reorder the terms: 0.25 + 0.5y + y2 = 8 + 0.25 Combine like terms: 8 + 0.25 = 8.25 0.25 + 0.5y + y2 = 8.25 Factor a perfect square on the left side: (y + 0.5)(y + 0.5) = 8.25 Calculate the square root of the right side: 2.872281323 Break this problem into two subproblems by setting (y + 0.5) equal to 2.872281323 and -2.872281323.Subproblem 1
y + 0.5 = 2.872281323 Simplifying y + 0.5 = 2.872281323 Reorder the terms: 0.5 + y = 2.872281323 Solving 0.5 + y = 2.872281323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 2.872281323 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 2.872281323 + -0.5 y = 2.872281323 + -0.5 Combine like terms: 2.872281323 + -0.5 = 2.372281323 y = 2.372281323 Simplifying y = 2.372281323Subproblem 2
y + 0.5 = -2.872281323 Simplifying y + 0.5 = -2.872281323 Reorder the terms: 0.5 + y = -2.872281323 Solving 0.5 + y = -2.872281323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -2.872281323 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -2.872281323 + -0.5 y = -2.872281323 + -0.5 Combine like terms: -2.872281323 + -0.5 = -3.372281323 y = -3.372281323 Simplifying y = -3.372281323Solution
The solution to the problem is based on the solutions from the subproblems. y = {2.372281323, -3.372281323}
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