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Simplifying y2 + -15y + 81 = 0 Reorder the terms: 81 + -15y + y2 = 0 Solving 81 + -15y + y2 = 0 Solving for variable 'y'. Begin completing the square. Move the constant term to the right: Add '-81' to each side of the equation. 81 + -15y + -81 + y2 = 0 + -81 Reorder the terms: 81 + -81 + -15y + y2 = 0 + -81 Combine like terms: 81 + -81 = 0 0 + -15y + y2 = 0 + -81 -15y + y2 = 0 + -81 Combine like terms: 0 + -81 = -81 -15y + y2 = -81 The y term is -15y. Take half its coefficient (-7.5). Square it (56.25) and add it to both sides. Add '56.25' to each side of the equation. -15y + 56.25 + y2 = -81 + 56.25 Reorder the terms: 56.25 + -15y + y2 = -81 + 56.25 Combine like terms: -81 + 56.25 = -24.75 56.25 + -15y + y2 = -24.75 Factor a perfect square on the left side: (y + -7.5)(y + -7.5) = -24.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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