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Simplifying 2x2 + -21x + 72 = 0 Reorder the terms: 72 + -21x + 2x2 = 0 Solving 72 + -21x + 2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 36 + -10.5x + x2 = 0 Move the constant term to the right: Add '-36' to each side of the equation. 36 + -10.5x + -36 + x2 = 0 + -36 Reorder the terms: 36 + -36 + -10.5x + x2 = 0 + -36 Combine like terms: 36 + -36 = 0 0 + -10.5x + x2 = 0 + -36 -10.5x + x2 = 0 + -36 Combine like terms: 0 + -36 = -36 -10.5x + x2 = -36 The x term is -10.5x. Take half its coefficient (-5.25). Square it (27.5625) and add it to both sides. Add '27.5625' to each side of the equation. -10.5x + 27.5625 + x2 = -36 + 27.5625 Reorder the terms: 27.5625 + -10.5x + x2 = -36 + 27.5625 Combine like terms: -36 + 27.5625 = -8.4375 27.5625 + -10.5x + x2 = -8.4375 Factor a perfect square on the left side: (x + -5.25)(x + -5.25) = -8.4375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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