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Simplifying (18 + -1x)(15 + x) = 280 Multiply (18 + -1x) * (15 + x) (18(15 + x) + -1x * (15 + x)) = 280 ((15 * 18 + x * 18) + -1x * (15 + x)) = 280 ((270 + 18x) + -1x * (15 + x)) = 280 (270 + 18x + (15 * -1x + x * -1x)) = 280 (270 + 18x + (-15x + -1x2)) = 280 Combine like terms: 18x + -15x = 3x (270 + 3x + -1x2) = 280 Solving 270 + 3x + -1x2 = 280 Solving for variable 'x'. Reorder the terms: 270 + -280 + 3x + -1x2 = 280 + -280 Combine like terms: 270 + -280 = -10 -10 + 3x + -1x2 = 280 + -280 Combine like terms: 280 + -280 = 0 -10 + 3x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. 10 + -3x + x2 = 0 Move the constant term to the right: Add '-10' to each side of the equation. 10 + -3x + -10 + x2 = 0 + -10 Reorder the terms: 10 + -10 + -3x + x2 = 0 + -10 Combine like terms: 10 + -10 = 0 0 + -3x + x2 = 0 + -10 -3x + x2 = 0 + -10 Combine like terms: 0 + -10 = -10 -3x + x2 = -10 The x term is -3x. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3x + 2.25 + x2 = -10 + 2.25 Reorder the terms: 2.25 + -3x + x2 = -10 + 2.25 Combine like terms: -10 + 2.25 = -7.75 2.25 + -3x + x2 = -7.75 Factor a perfect square on the left side: (x + -1.5)(x + -1.5) = -7.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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