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I. 2b2- 37b + 143 = 0 2b2-11b - 26b + 143 = 0 b(2b-11) - 13(2b-11) = 0 (b-13) (2b-11) = 0 b = 13, 5.5 II. 2a2+ 15a - 143 = 0 2a2+ 26a - 11a - 143 = 0 2a(a+13) - 11(a+13) = 0 (2a-11) (a+13) = 0 a = -13, 5.5 Hence a ≤ b.
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