Factorise Fully

Question 1:

9s−90
9 s−10

Question 2:

49b−35
7 7b−5

Question 3:

56a+32
8 7a+4

Question 4:

5z2−8z
z 5z−8

Question 5:

5kn−7n
n 5k−7

Question 6:

40s2−12bs
4s 10s−3b