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Simplifying 8x = x2 + 20 Reorder the terms: 8x = 20 + x2 Solving 8x = 20 + x2 Solving for variable 'x'. Reorder the terms: -20 + 8x + -1x2 = 20 + x2 + -20 + -1x2 Reorder the terms: -20 + 8x + -1x2 = 20 + -20 + x2 + -1x2 Combine like terms: 20 + -20 = 0 -20 + 8x + -1x2 = 0 + x2 + -1x2 -20 + 8x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -20 + 8x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. 20 + -8x + x2 = 0 Move the constant term to the right: Add '-20' to each side of the equation. 20 + -8x + -20 + x2 = 0 + -20 Reorder the terms: 20 + -20 + -8x + x2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -8x + x2 = 0 + -20 -8x + x2 = 0 + -20 Combine like terms: 0 + -20 = -20 -8x + x2 = -20 The x term is -8x. Take half its coefficient (-4). Square it (16) and add it to both sides. Add '16' to each side of the equation. -8x + 16 + x2 = -20 + 16 Reorder the terms: 16 + -8x + x2 = -20 + 16 Combine like terms: -20 + 16 = -4 16 + -8x + x2 = -4 Factor a perfect square on the left side: (x + -4)(x + -4) = -4 Can't calculate square root of the right side. The solution to this equation could not be determined.
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