Expanding Brackets

Question 1:

7 n4
7n28

Question 2:

6 3m+10
18m+60

Question 3:

9 9t10
81t90

Question 4:

y 5y+3
5y2+3y

Question 5:

y 4g+9
4gy+9y

Question 6:

5k 3k+4s
15k2+20ks