Упростите выражение (2х-5у)(4х+3у)-(5х-6у)(х+2у)

Question

Упростите выражение (2х-5у)(4х+3у)-(5х-6у)(х+2у)

Answer 1

8x²+6xy-20xy-15y²-(5x²-6xy+10xy-12y²)=8x²+6xy-20xy-15y²-5x²+6xy-10xy+12y²=3x²-18xy-3y²