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Simplifying 3n2 + -5n + 12 = 9 Reorder the terms: 12 + -5n + 3n2 = 9 Solving 12 + -5n + 3n2 = 9 Solving for variable 'n'. Reorder the terms: 12 + -9 + -5n + 3n2 = 9 + -9 Combine like terms: 12 + -9 = 3 3 + -5n + 3n2 = 9 + -9 Combine like terms: 9 + -9 = 0 3 + -5n + 3n2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. 1 + -1.666666667n + n2 = 0 Move the constant term to the right: Add '-1' to each side of the equation. 1 + -1.666666667n + -1 + n2 = 0 + -1 Reorder the terms: 1 + -1 + -1.666666667n + n2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1.666666667n + n2 = 0 + -1 -1.666666667n + n2 = 0 + -1 Combine like terms: 0 + -1 = -1 -1.666666667n + n2 = -1 The n term is -1.666666667n. Take half its coefficient (-0.8333333335). Square it (0.6944444447) and add it to both sides. Add '0.6944444447' to each side of the equation. -1.666666667n + 0.6944444447 + n2 = -1 + 0.6944444447 Reorder the terms: 0.6944444447 + -1.666666667n + n2 = -1 + 0.6944444447 Combine like terms: -1 + 0.6944444447 = -0.3055555553 0.6944444447 + -1.666666667n + n2 = -0.3055555553 Factor a perfect square on the left side: (n + -0.8333333335)(n + -0.8333333335) = -0.3055555553 Can't calculate square root of the right side. The solution to this equation could not be determined.
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