Answer :
factor
fg-5g+4f-20
g(f-5)+4(f-5)
now we factor out the (f-5) in both terms
(f-5)(g+4) is the factored out form
fg-5g+4f-20
g(f-5)+4(f-5)
now we factor out the (f-5) in both terms
(f-5)(g+4) is the factored out form
