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Simplifying y2 + -40y + 720 = 0 Reorder the terms: 720 + -40y + y2 = 0 Solving 720 + -40y + y2 = 0 Solving for variable 'y'. Begin completing the square. Move the constant term to the right: Add '-720' to each side of the equation. 720 + -40y + -720 + y2 = 0 + -720 Reorder the terms: 720 + -720 + -40y + y2 = 0 + -720 Combine like terms: 720 + -720 = 0 0 + -40y + y2 = 0 + -720 -40y + y2 = 0 + -720 Combine like terms: 0 + -720 = -720 -40y + y2 = -720 The y term is -40y. Take half its coefficient (-20). Square it (400) and add it to both sides. Add '400' to each side of the equation. -40y + 400 + y2 = -720 + 400 Reorder the terms: 400 + -40y + y2 = -720 + 400 Combine like terms: -720 + 400 = -320 400 + -40y + y2 = -320 Factor a perfect square on the left side: (y + -20)(y + -20) = -320 Can't calculate square root of the right side. The solution to this equation could not be determined.
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