Question

the LCM of (3a-15) and (3asquare-75) is?

Answer 1

3a – 15 = 3(a – 5) and 3a² – 75 = 3(a² – 25) = 3(a – 5)(a + 5)
Hence, it can be seen that 3a – 15 is a factor of 3a² – 75.
Hence, the LCM of (3a – 15) and (3a² – 75) is 3a² – 75 only.