1)(2х-3у)(2х+3у) 2)(5х+3у) (3у-5х)

Question

1)(2х-3у)(2х+3у) 2)(5х+3у) (3у-5х)

Answer 1

1)4х^2+6xy-6xy- 9 y^2 = 4x^2-9y^2
2) 15xy-25x^2+9y^2-15xy= 9y^2-25x^2