Question

What is the answer?

Answer 1

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