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Simplifying 2y2 + -3y = 15 Reorder the terms: -3y + 2y2 = 15 Solving -3y + 2y2 = 15 Solving for variable 'y'. Reorder the terms: -15 + -3y + 2y2 = 15 + -15 Combine like terms: 15 + -15 = 0 -15 + -3y + 2y2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -7.5 + -1.5y + y2 = 0 Move the constant term to the right: Add '7.5' to each side of the equation. -7.5 + -1.5y + 7.5 + y2 = 0 + 7.5 Reorder the terms: -7.5 + 7.5 + -1.5y + y2 = 0 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + -1.5y + y2 = 0 + 7.5 -1.5y + y2 = 0 + 7.5 Combine like terms: 0 + 7.5 = 7.5 -1.5y + y2 = 7.5 The y term is -1.5y. Take half its coefficient (-0.75). Square it (0.5625) and add it to both sides. Add '0.5625' to each side of the equation. -1.5y + 0.5625 + y2 = 7.5 + 0.5625 Reorder the terms: 0.5625 + -1.5y + y2 = 7.5 + 0.5625 Combine like terms: 7.5 + 0.5625 = 8.0625 0.5625 + -1.5y + y2 = 8.0625 Factor a perfect square on the left side: (y + -0.75)(y + -0.75) = 8.0625 Calculate the square root of the right side: 2.839454173 Break this problem into two subproblems by setting (y + -0.75) equal to 2.839454173 and -2.839454173.Subproblem 1
y + -0.75 = 2.839454173 Simplifying y + -0.75 = 2.839454173 Reorder the terms: -0.75 + y = 2.839454173 Solving -0.75 + y = 2.839454173 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + y = 2.839454173 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + y = 2.839454173 + 0.75 y = 2.839454173 + 0.75 Combine like terms: 2.839454173 + 0.75 = 3.589454173 y = 3.589454173 Simplifying y = 3.589454173Subproblem 2
y + -0.75 = -2.839454173 Simplifying y + -0.75 = -2.839454173 Reorder the terms: -0.75 + y = -2.839454173 Solving -0.75 + y = -2.839454173 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + y = -2.839454173 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + y = -2.839454173 + 0.75 y = -2.839454173 + 0.75 Combine like terms: -2.839454173 + 0.75 = -2.089454173 y = -2.089454173 Simplifying y = -2.089454173Solution
The solution to the problem is based on the solutions from the subproblems. y = {3.589454173, -2.089454173}
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