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Simplifying -4 = 4y2 + -5y Reorder the terms: -4 = -5y + 4y2 Solving -4 = -5y + 4y2 Solving for variable 'y'. Reorder the terms: -4 + 5y + -4y2 = -5y + 5y + 4y2 + -4y2 Combine like terms: -5y + 5y = 0 -4 + 5y + -4y2 = 0 + 4y2 + -4y2 -4 + 5y + -4y2 = 4y2 + -4y2 Combine like terms: 4y2 + -4y2 = 0 -4 + 5y + -4y2 = 0 Begin completing the square. Divide all terms by -4 the coefficient of the squared term: Divide each side by '-4'. 1 + -1.25y + y2 = 0 Move the constant term to the right: Add '-1' to each side of the equation. 1 + -1.25y + -1 + y2 = 0 + -1 Reorder the terms: 1 + -1 + -1.25y + y2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1.25y + y2 = 0 + -1 -1.25y + y2 = 0 + -1 Combine like terms: 0 + -1 = -1 -1.25y + y2 = -1 The y term is -1.25y. Take half its coefficient (-0.625). Square it (0.390625) and add it to both sides. Add '0.390625' to each side of the equation. -1.25y + 0.390625 + y2 = -1 + 0.390625 Reorder the terms: 0.390625 + -1.25y + y2 = -1 + 0.390625 Combine like terms: -1 + 0.390625 = -0.609375 0.390625 + -1.25y + y2 = -0.609375 Factor a perfect square on the left side: (y + -0.625)(y + -0.625) = -0.609375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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