Question

Find Products using suitable identities.
(49x^4- 21 x^2 y^2+ 9y^4)

Answer 1

first of all the question is wrong. According to me it should be 49x⁴- 42

x²y² + 9y⁴ now it can be done by two methods one is middle term splitting and the other is whole square method so I will do the question with both methods for your convenience.