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Simplifying 3x2 + 12x = -20 Reorder the terms: 12x + 3x2 = -20 Solving 12x + 3x2 = -20 Solving for variable 'x'. Reorder the terms: 20 + 12x + 3x2 = -20 + 20 Combine like terms: -20 + 20 = 0 20 + 12x + 3x2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. 6.666666667 + 4x + x2 = 0 Move the constant term to the right: Add '-6.666666667' to each side of the equation. 6.666666667 + 4x + -6.666666667 + x2 = 0 + -6.666666667 Reorder the terms: 6.666666667 + -6.666666667 + 4x + x2 = 0 + -6.666666667 Combine like terms: 6.666666667 + -6.666666667 = 0.000000000 0.000000000 + 4x + x2 = 0 + -6.666666667 4x + x2 = 0 + -6.666666667 Combine like terms: 0 + -6.666666667 = -6.666666667 4x + x2 = -6.666666667 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = -6.666666667 + 4 Reorder the terms: 4 + 4x + x2 = -6.666666667 + 4 Combine like terms: -6.666666667 + 4 = -2.666666667 4 + 4x + x2 = -2.666666667 Factor a perfect square on the left side: (x + 2)(x + 2) = -2.666666667 Can't calculate square root of the right side. The solution to this equation could not be determined.
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