Answer:

sorry I don't know the answer

Answer:

x² y²  - z² w²

Step-by-step explanation:

let xy = a

let zw = b

(xy + zw) (xy - zw) = (a + b) (a - b)

∵ (a + b) (a - b) = a² - b² is the identity

∴ (xy + zw) (xy - zw) = (xy)² - (zw)²

                                = x² y²  - z² w²

Bhai brainliest dede pls