Question 92 (iv)
Factorise the following using the identity a2−b2=(a+b)(a−b).
3a2b3−27a4b
3a2b3−27a4b=3a2b(b2−9a2)=3a2b[b2−(3a)2]=3a2b(b+3a)(b−3a)
Question 92 (ii)
4x2−25y2
Question 92 (vi)
9x2−1
Question 92 (xxvi)
(a−b)2−(b−c)2
Question 92 (xxiii)
x4−y4