Question 92 (xxi)
Factorise the following using the identity a2−b2=(a+b)(a−b).
p5−16p
p5−16p=p(p4−16)=p[(p2)2−42]=p(p2+4)(p2−4)=p(p2+4)(p2−22)=p(p2+4)(p+2)(p−2)
Question 92 (i)
x2−9
Question 92 (xix)
x4−1
Question 92 (vii)
25ax2−25a
Question 92 (xxvi)
(a−b)2−(b−c)2