#### Answer

3m(2m−5)

#### Work Step by Step

Find the greatest common factor. Find the factors of each term and multiply the factors that are common to all the terms.
$6m^2$=3×2×m×m
15m=5×3×m
GCF=3×m=3m
Factor the GCF out of each term.
$6m^2−15m=3m(2m−5)$