Simplify each of the following:
(i) 7x3y + 9yx3
(ii) 12a2b + 3ba2
(i) Given 7x3y + 9yx3
7x3y + 9yx3
= (7 + 9) x3y
= 16x3y
(ii) Given
12a2b + 3ba2
= (12 + 3) a2b
= 15a2b
