Carry out the multiplication of the expressions in each of the following pairs: `ab,a-b`

Carry out the multiplication of the expressions in each of the following pairs: a+b , 7a^2b^2

Carry out the multiplication of the expressions in each of the following pairs: a^2-9,4a

Carry out the multiplication of the expressions in each of the following pairs: 4p,q+r

Carry out the multiplication of the expressions in each of the following pairs: pq+qr+rp, 0

Find out the right matching from the following pairs:

Find the multiplicative invers of each of the complex number -i

Find the union of each of the following pairs of sets : A = {1, 2, 3}, B = φ

Identify the operations (addition, subtraction, division, multiplication) in forming the following expressions and tell how the expressions have been formed. (b) 17y,y/17,5z