Question 92 (xv)
Factorise the following using the identity a2−b2=(a+b)(a−b).
x3y9−xy316
x3y9−xy316=xy(x29−y216)=xy[(x3)2−(y4)2]=xy(x3+y4)(x3−y4)
Question 92 (xiv)
4x29−9y216
Question 92 (xxx)
x2−y2100
Question 92 (xxv)
16x4−625y4
Question 92 (vi)
9x2−1