Question

5. Evaluate :
(i) (6 - xy) (6 + xy)
(ii)
7x + 2 y ) ( 7x - 2 y
a
2b
+
(iii)
2b
2b
а
2b
a
a
2)
:) (
-
3x +
1
1
3x
(iv)
2y
2y
(v) (2a + 3) (2a -3) (4a2 + 9)
(vi) (a + bc) (a - bc)(a + bc)
(vii) (5x + 8y) (3x + 5y)
(vii) (7x + 15y) (5x - 4y)
(ix) (2a - 3b) (3a + 4b)
(x) (9a - 7b) (3a - b)​

Answer 1

Answer:

simply use identies in all questions but it is not possible to do all questions only first I explain you by using identity (6-xy) (6+xy)

by using identity (a+b) (a-b)= a^-b^

(6)^-(xy)^

36-xy^

(36+xy)(36-xy)

And you have to use the identity in all questions , some questions will solve with this identity and other will solve by these two identies

(a-b)^= a^-2ab - b^

(a+b)^=a^+2ab-b^