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Simplifying 6x2 + -20x + 21 = 0 Reorder the terms: 21 + -20x + 6x2 = 0 Solving 21 + -20x + 6x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 6 the coefficient of the squared term: Divide each side by '6'. 3.5 + -3.333333333x + x2 = 0 Move the constant term to the right: Add '-3.5' to each side of the equation. 3.5 + -3.333333333x + -3.5 + x2 = 0 + -3.5 Reorder the terms: 3.5 + -3.5 + -3.333333333x + x2 = 0 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + -3.333333333x + x2 = 0 + -3.5 -3.333333333x + x2 = 0 + -3.5 Combine like terms: 0 + -3.5 = -3.5 -3.333333333x + x2 = -3.5 The x term is -3.333333333x. Take half its coefficient (-1.666666667). Square it (2.777777779) and add it to both sides. Add '2.777777779' to each side of the equation. -3.333333333x + 2.777777779 + x2 = -3.5 + 2.777777779 Reorder the terms: 2.777777779 + -3.333333333x + x2 = -3.5 + 2.777777779 Combine like terms: -3.5 + 2.777777779 = -0.722222221 2.777777779 + -3.333333333x + x2 = -0.722222221 Factor a perfect square on the left side: (x + -1.666666667)(x + -1.666666667) = -0.722222221 Can't calculate square root of the right side. The solution to this equation could not be determined.
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