Question 85 (xii)
Expand the following, using suitable identities.
(x2+y2)(x2−y2)
We have, (x2+y2)(x2−y2)=(x2)2−(y2)2 [using the identity, (a+b)(a−b)=a2−b2] =x4−y4
Question 85 (i)
(xy+yz)2
Question 85 (ii)
(x2y−xy2)2
Question 85 (iv)
(23x−32y)2
Question 85 (xiii)
(a2+b2)2
Question 85 (vi)
(x+3)(x+7)