As an equation if: 6x = 72 then x = 12
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x2 - 18x + 72 = 0 (x - 6)(x - 12) = 0 x ∈ {6, 12}
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6 + 12 = 18 6 * 12 = 72
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2x2 - 72 would be factored into (2x - 12)(x + 6) or (2x + 12)(x - 6) To double check, multiply each pair: (2x - 12)(x + 6) = 2x2 + 12x - 12x - 72 = 2x2 - 72 (2x + 12)(x - 6) = 2x2 - 12x + 12 x - 72 = 2x2 - 72