Question

Q. # 15 please help to solve

Answer 1

Since

`18x^3=2\cdot 3\cdot 3\cdot x\cdot x\cdot x \\ \\ 30x^5=2\cdot 3\cdot 5\cdot x\cdot x\cdot x\cdot x\cdot x`
you can see that common expression is

`2\cdot 3\cdot x\cdot x\cdot x=6x^3`.
Answer: Correct choice is A.