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Simplifying 9x2 + 79 = -18x Reorder the terms: 79 + 9x2 = -18x Solving 79 + 9x2 = -18x Solving for variable 'x'. Reorder the terms: 79 + 18x + 9x2 = -18x + 18x Combine like terms: -18x + 18x = 0 79 + 18x + 9x2 = 0 Begin completing the square. Divide all terms by 9 the coefficient of the squared term: Divide each side by '9'. 8.777777778 + 2x + x2 = 0 Move the constant term to the right: Add '-8.777777778' to each side of the equation. 8.777777778 + 2x + -8.777777778 + x2 = 0 + -8.777777778 Reorder the terms: 8.777777778 + -8.777777778 + 2x + x2 = 0 + -8.777777778 Combine like terms: 8.777777778 + -8.777777778 = 0.000000000 0.000000000 + 2x + x2 = 0 + -8.777777778 2x + x2 = 0 + -8.777777778 Combine like terms: 0 + -8.777777778 = -8.777777778 2x + x2 = -8.777777778 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = -8.777777778 + 1 Reorder the terms: 1 + 2x + x2 = -8.777777778 + 1 Combine like terms: -8.777777778 + 1 = -7.777777778 1 + 2x + x2 = -7.777777778 Factor a perfect square on the left side: (x + 1)(x + 1) = -7.777777778 Can't calculate square root of the right side. The solution to this equation could not be determined.
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