Question 85 (xiii)
Expand the following, using suitable identities.
(a2+b2)2
We have, (a2+b2)2=(a2)2+(b2)2+2a2×b2=a4+b4+2a2b2 [using the identity, (a+b)2=a2+b2+2ab]
Question 85 (ii)
(x2y−xy2)2
Question 85 (i)
(xy+yz)2
Question 85 (xii)
(x2+y2)(x2−y2)
Question 85 (xiv)
(7x+5)2