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Simplifying 40 + -21x + 3x2 = 0 Solving 40 + -21x + 3x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. 13.33333333 + -7x + x2 = 0 Move the constant term to the right: Add '-13.33333333' to each side of the equation. 13.33333333 + -7x + -13.33333333 + x2 = 0 + -13.33333333 Reorder the terms: 13.33333333 + -13.33333333 + -7x + x2 = 0 + -13.33333333 Combine like terms: 13.33333333 + -13.33333333 = 0.00000000 0.00000000 + -7x + x2 = 0 + -13.33333333 -7x + x2 = 0 + -13.33333333 Combine like terms: 0 + -13.33333333 = -13.33333333 -7x + x2 = -13.33333333 The x term is -7x. Take half its coefficient (-3.5). Square it (12.25) and add it to both sides. Add '12.25' to each side of the equation. -7x + 12.25 + x2 = -13.33333333 + 12.25 Reorder the terms: 12.25 + -7x + x2 = -13.33333333 + 12.25 Combine like terms: -13.33333333 + 12.25 = -1.08333333 12.25 + -7x + x2 = -1.08333333 Factor a perfect square on the left side: (x + -3.5)(x + -3.5) = -1.08333333 Can't calculate square root of the right side. The solution to this equation could not be determined.
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