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Simplifying 2y2 + 6y + -15 = 0 Reorder the terms: -15 + 6y + 2y2 = 0 Solving -15 + 6y + 2y2 = 0 Solving for variable 'y'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -7.5 + 3y + y2 = 0 Move the constant term to the right: Add '7.5' to each side of the equation. -7.5 + 3y + 7.5 + y2 = 0 + 7.5 Reorder the terms: -7.5 + 7.5 + 3y + y2 = 0 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + 3y + y2 = 0 + 7.5 3y + y2 = 0 + 7.5 Combine like terms: 0 + 7.5 = 7.5 3y + y2 = 7.5 The y term is 3y. Take half its coefficient (1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. 3y + 2.25 + y2 = 7.5 + 2.25 Reorder the terms: 2.25 + 3y + y2 = 7.5 + 2.25 Combine like terms: 7.5 + 2.25 = 9.75 2.25 + 3y + y2 = 9.75 Factor a perfect square on the left side: (y + 1.5)(y + 1.5) = 9.75 Calculate the square root of the right side: 3.122498999 Break this problem into two subproblems by setting (y + 1.5) equal to 3.122498999 and -3.122498999.Subproblem 1
y + 1.5 = 3.122498999 Simplifying y + 1.5 = 3.122498999 Reorder the terms: 1.5 + y = 3.122498999 Solving 1.5 + y = 3.122498999 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = 3.122498999 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = 3.122498999 + -1.5 y = 3.122498999 + -1.5 Combine like terms: 3.122498999 + -1.5 = 1.622498999 y = 1.622498999 Simplifying y = 1.622498999Subproblem 2
y + 1.5 = -3.122498999 Simplifying y + 1.5 = -3.122498999 Reorder the terms: 1.5 + y = -3.122498999 Solving 1.5 + y = -3.122498999 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = -3.122498999 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = -3.122498999 + -1.5 y = -3.122498999 + -1.5 Combine like terms: -3.122498999 + -1.5 = -4.622498999 y = -4.622498999 Simplifying y = -4.622498999Solution
The solution to the problem is based on the solutions from the subproblems. y = {1.622498999, -4.622498999}
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