Respuesta :

Answer:

Since both terms are perfect squares, factor using the difference of squares formula,  

a

2

b

2

=

(

a

+

b

)

(

a

b

)

where  

a

=

k

2

and  

b

=

1

.

9

(

36

k

6

+

k

5

k

2

)

The GCF is -3k^4
-30k^6+9k^5-21k^4= -3k^4(10k^2-3k+7)