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15t2 squared-t-15t+3=15t squared-14t+3
15t² - 15t - 30 = 15(t - 2)(t + 1)
15t2 is one term. To find a GCF, you need at least two.
The question is somewhat ambiguous: the answers are LCM[3T2, 5T] =15T2 or LCM[(3T)2, 5T] =45T2