Question

Factorise using identities x² / 9 - y² / 25​

Answer 1

Answer:

x2/3^2-(y2/5^2)

(x/3)^2-(y/5)^2

using a2-b2=(a+b)(a-b)

(x/3+y/5)(x/3-y/5)

(5x+3y/15)(5x-3y/15)

using (a+b)(a-b)=a2-b2

(5x)^2-(3y)^2/225

25x2-9y2/225