Question

What is the answer?

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I think it could be either of the three's

Answer 1

`18x^2=2\cdot\boxed{3}\cdot3\cdot\boxed{x}\cdot\boxed{x}\\\\\15x^5=\boxed{3}\cdot5\cdot\boxed{x}\cdot\boxed{x}\cdot x\cdot x\cdot x\\\\GCF(18x^2,\ 15x^5)=\boxed{3}\cdot\boxed{x}\cdot\boxed{x}=\boxed{\boxed{3x^2}}`