(3x - 4y)² =... Tolong bantuannya dong

(3x - 4y) (3x - 4y)
= 9x²-12xy-12xy+16y²
=9x²-24xy+16y²

= (3x - 4y)(3x - 4y)
= 3x(3x - 4y) -4y(3x - 4y)
= 9x²-12xy-12xy+16y²
= 9x²-24xy+16y²