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Simplifying 4x2 + -21x + 39 = 0 Reorder the terms: 39 + -21x + 4x2 = 0 Solving 39 + -21x + 4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 9.75 + -5.25x + x2 = 0 Move the constant term to the right: Add '-9.75' to each side of the equation. 9.75 + -5.25x + -9.75 + x2 = 0 + -9.75 Reorder the terms: 9.75 + -9.75 + -5.25x + x2 = 0 + -9.75 Combine like terms: 9.75 + -9.75 = 0.00 0.00 + -5.25x + x2 = 0 + -9.75 -5.25x + x2 = 0 + -9.75 Combine like terms: 0 + -9.75 = -9.75 -5.25x + x2 = -9.75 The x term is -5.25x. Take half its coefficient (-2.625). Square it (6.890625) and add it to both sides. Add '6.890625' to each side of the equation. -5.25x + 6.890625 + x2 = -9.75 + 6.890625 Reorder the terms: 6.890625 + -5.25x + x2 = -9.75 + 6.890625 Combine like terms: -9.75 + 6.890625 = -2.859375 6.890625 + -5.25x + x2 = -2.859375 Factor a perfect square on the left side: (x + -2.625)(x + -2.625) = -2.859375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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