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Simplifying 21x2 + -21x + 40 = 0 Reorder the terms: 40 + -21x + 21x2 = 0 Solving 40 + -21x + 21x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 21 the coefficient of the squared term: Divide each side by '21'. 1.904761905 + -1x + x2 = 0 Move the constant term to the right: Add '-1.904761905' to each side of the equation. 1.904761905 + -1x + -1.904761905 + x2 = 0 + -1.904761905 Reorder the terms: 1.904761905 + -1.904761905 + -1x + x2 = 0 + -1.904761905 Combine like terms: 1.904761905 + -1.904761905 = 0.000000000 0.000000000 + -1x + x2 = 0 + -1.904761905 -1x + x2 = 0 + -1.904761905 Combine like terms: 0 + -1.904761905 = -1.904761905 -1x + x2 = -1.904761905 The x term is -1x. Take half its coefficient (-0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. -1x + 0.25 + x2 = -1.904761905 + 0.25 Reorder the terms: 0.25 + -1x + x2 = -1.904761905 + 0.25 Combine like terms: -1.904761905 + 0.25 = -1.654761905 0.25 + -1x + x2 = -1.654761905 Factor a perfect square on the left side: (x + -0.5)(x + -0.5) = -1.654761905 Can't calculate square root of the right side. The solution to this equation could not be determined.
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