x2 – xz + xy – yz=?

= x2 – xz + xy – yz= x(x – z) +y(x – z) (taking x and y as common resp.)= (x + y)(x – z).

Q9 of 137 Page 103

x² – xz + xy – yz=?

= x² – xz + xy – yz

= x(x – z) +y(x – z) (taking x and y as common resp.)

= (x + y)(x – z).

ab – mn + an – bm =?

ab – a – b + 1= ?

12m² – 27 =?

x³ – x =?