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Simplifying 7x2 + 4x + 84 = 0 Reorder the terms: 84 + 4x + 7x2 = 0 Solving 84 + 4x + 7x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 7 the coefficient of the squared term: Divide each side by '7'. 12 + 0.5714285714x + x2 = 0 Move the constant term to the right: Add '-12' to each side of the equation. 12 + 0.5714285714x + -12 + x2 = 0 + -12 Reorder the terms: 12 + -12 + 0.5714285714x + x2 = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 0.5714285714x + x2 = 0 + -12 0.5714285714x + x2 = 0 + -12 Combine like terms: 0 + -12 = -12 0.5714285714x + x2 = -12 The x term is 0.5714285714x. Take half its coefficient (0.2857142857). Square it (0.08163265305) and add it to both sides. Add '0.08163265305' to each side of the equation. 0.5714285714x + 0.08163265305 + x2 = -12 + 0.08163265305 Reorder the terms: 0.08163265305 + 0.5714285714x + x2 = -12 + 0.08163265305 Combine like terms: -12 + 0.08163265305 = -11.91836734695 0.08163265305 + 0.5714285714x + x2 = -11.91836734695 Factor a perfect square on the left side: (x + 0.2857142857)(x + 0.2857142857) = -11.91836734695 Can't calculate square root of the right side. The solution to this equation could not be determined.
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