Question

What is the least common multiple of 10a^4 and 4a^2

Answer 1

so factor
10a^2=2 times 5 times a times a
4a^2=2 times 2 times a time a
so it needs at leas 2 pairs of 2 and 1 5 and 2 a's
2 times 2 times 5 times a times a=20a^2
lcm=20a^2