Question

Square of 9x – 7xy is

Options:

(a) `81x^2 + 49x^2y^2`

(b) `81x^2 – 49x^2y^2`

(c) `81x^2 + 49x^2y^2 –126x^2y`

(d) `81x^2 + 49x^2y^2 – 63x^2y`