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Simplifying y2 + -8y = -18 Reorder the terms: -8y + y2 = -18 Solving -8y + y2 = -18 Solving for variable 'y'. Reorder the terms: 18 + -8y + y2 = -18 + 18 Combine like terms: -18 + 18 = 0 18 + -8y + y2 = 0 Begin completing the square. Move the constant term to the right: Add '-18' to each side of the equation. 18 + -8y + -18 + y2 = 0 + -18 Reorder the terms: 18 + -18 + -8y + y2 = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -8y + y2 = 0 + -18 -8y + y2 = 0 + -18 Combine like terms: 0 + -18 = -18 -8y + y2 = -18 The y term is -8y. Take half its coefficient (-4). Square it (16) and add it to both sides. Add '16' to each side of the equation. -8y + 16 + y2 = -18 + 16 Reorder the terms: 16 + -8y + y2 = -18 + 16 Combine like terms: -18 + 16 = -2 16 + -8y + y2 = -2 Factor a perfect square on the left side: (y + -4)(y + -4) = -2 Can't calculate square root of the right side. The solution to this equation could not be determined.
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