What is the least common multiple (lcm) of these monomials? 12a^2 b^6, 28a^4, 42ab^3

the answer is c)8

step-by-step explanaction:

step by step solution :

step   1   :

1.1     4 = 22

(4)3 = (22)3 = 26

equation at the end of step   1   :

  ((23) • 26)2

step   2   :

equation at the end of step   2   :

  (23 • 26)2

step   3   :

final result :

  218

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