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Simplifying 3x2 + 4x + 21 = 0 Reorder the terms: 21 + 4x + 3x2 = 0 Solving 21 + 4x + 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'. 7 + 1.333333333x + x2 = 0 Move the constant term to the right: Add '-7' to each side of the equation. 7 + 1.333333333x + -7 + x2 = 0 + -7 Reorder the terms: 7 + -7 + 1.333333333x + x2 = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 1.333333333x + x2 = 0 + -7 1.333333333x + x2 = 0 + -7 Combine like terms: 0 + -7 = -7 1.333333333x + x2 = -7 The x term is 1.333333333x. Take half its coefficient (0.6666666665). Square it (0.4444444442) and add it to both sides. Add '0.4444444442' to each side of the equation. 1.333333333x + 0.4444444442 + x2 = -7 + 0.4444444442 Reorder the terms: 0.4444444442 + 1.333333333x + x2 = -7 + 0.4444444442 Combine like terms: -7 + 0.4444444442 = -6.5555555558 0.4444444442 + 1.333333333x + x2 = -6.5555555558 Factor a perfect square on the left side: (x + 0.6666666665)(x + 0.6666666665) = -6.5555555558 Can't calculate square root of the right side. The solution to this equation could not be determined.
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