Verified answer

2. х²-2х+3х-6-(х²+х+4х-4)=3х

х²-2х+3х-6-х²-х-4х+4=3х

х²-2х+3х-6-х²-х-4х+4-3х=0

-8х-2=0

-8х=2

х=-0,25

3.(х+у)(х²-ху+у²)=(х+у)(х-у)²=(х²-у²)(х-у)=х³-х²у-у²х+у³

4.х²-5х+2х-10-3х+6х²=7х²-6х-10