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2³ , 5 , 7 and 9 because 2³ * 5 * 7 * 9 = 2520 Factor tree: 2520 2 x 1260 2 x 2 x 630 2 x 2 x 2 x 315 2 x 2 x 2 x 3 x 105 2 x 2 x 2 x 3 x 3 x 35 2 x 2 x 2 x 3 x 3 x 5 x 7 The prime factorization of 2520 is 2 x 2 x 2 x 3 x 3 x 5 x 7 or 23 x 32 x 5 x 7.
x + 5 = 3 x = -2
2 x 2 x 2 x 2 x 3 x 3 x 3 x 3 x 5 = 6480
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2 x 3 x 3 x 3 = 54 2 x 3 x 5 x 7 = 210 2 x 3 x 3 x 3 x 5 x 7 = 1890, the LCM