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Simplifying y2 + -1y + -120 = 0 Reorder the terms: -120 + -1y + y2 = 0 Solving -120 + -1y + y2 = 0 Solving for variable 'y'. Begin completing the square. Move the constant term to the right: Add '120' to each side of the equation. -120 + -1y + 120 + y2 = 0 + 120 Reorder the terms: -120 + 120 + -1y + y2 = 0 + 120 Combine like terms: -120 + 120 = 0 0 + -1y + y2 = 0 + 120 -1y + y2 = 0 + 120 Combine like terms: 0 + 120 = 120 -1y + y2 = 120 The y term is -1y. 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. -1y + 0.25 + y2 = 120 + 0.25 Reorder the terms: 0.25 + -1y + y2 = 120 + 0.25 Combine like terms: 120 + 0.25 = 120.25 0.25 + -1y + y2 = 120.25 Factor a perfect square on the left side: (y + -0.5)(y + -0.5) = 120.25 Calculate the square root of the right side: 10.9658561 Break this problem into two subproblems by setting (y + -0.5) equal to 10.9658561 and -10.9658561.Subproblem 1
y + -0.5 = 10.9658561 Simplifying y + -0.5 = 10.9658561 Reorder the terms: -0.5 + y = 10.9658561 Solving -0.5 + y = 10.9658561 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 = 10.9658561 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 10.9658561 + 0.5 y = 10.9658561 + 0.5 Combine like terms: 10.9658561 + 0.5 = 11.4658561 y = 11.4658561 Simplifying y = 11.4658561Subproblem 2
y + -0.5 = -10.9658561 Simplifying y + -0.5 = -10.9658561 Reorder the terms: -0.5 + y = -10.9658561 Solving -0.5 + y = -10.9658561 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 = -10.9658561 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -10.9658561 + 0.5 y = -10.9658561 + 0.5 Combine like terms: -10.9658561 + 0.5 = -10.4658561 y = -10.4658561 Simplifying y = -10.4658561Solution
The solution to the problem is based on the solutions from the subproblems. y = {11.4658561, -10.4658561}
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