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Simplifying y2 + -6y + -15 = 0 Reorder the terms: -15 + -6y + y2 = 0 Solving -15 + -6y + y2 = 0 Solving for variable 'y'. Begin completing the square. Move the constant term to the right: Add '15' to each side of the equation. -15 + -6y + 15 + y2 = 0 + 15 Reorder the terms: -15 + 15 + -6y + y2 = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -6y + y2 = 0 + 15 -6y + y2 = 0 + 15 Combine like terms: 0 + 15 = 15 -6y + y2 = 15 The y term is -6y. Take half its coefficient (-3). Square it (9) and add it to both sides. Add '9' to each side of the equation. -6y + 9 + y2 = 15 + 9 Reorder the terms: 9 + -6y + y2 = 15 + 9 Combine like terms: 15 + 9 = 24 9 + -6y + y2 = 24 Factor a perfect square on the left side: (y + -3)(y + -3) = 24 Calculate the square root of the right side: 4.898979486 Break this problem into two subproblems by setting (y + -3) equal to 4.898979486 and -4.898979486.Subproblem 1
y + -3 = 4.898979486 Simplifying y + -3 = 4.898979486 Reorder the terms: -3 + y = 4.898979486 Solving -3 + y = 4.898979486 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = 4.898979486 + 3 Combine like terms: -3 + 3 = 0 0 + y = 4.898979486 + 3 y = 4.898979486 + 3 Combine like terms: 4.898979486 + 3 = 7.898979486 y = 7.898979486 Simplifying y = 7.898979486Subproblem 2
y + -3 = -4.898979486 Simplifying y + -3 = -4.898979486 Reorder the terms: -3 + y = -4.898979486 Solving -3 + y = -4.898979486 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = -4.898979486 + 3 Combine like terms: -3 + 3 = 0 0 + y = -4.898979486 + 3 y = -4.898979486 + 3 Combine like terms: -4.898979486 + 3 = -1.898979486 y = -1.898979486 Simplifying y = -1.898979486Solution
The solution to the problem is based on the solutions from the subproblems. y = {7.898979486, -1.898979486}
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