Упростите выражение (6 р+с) (с-6р)-(2р-3с)(3с+2р)

Question

Упростите выражение (6 р+с) (с-6р)-(2р-3с)(3с+2р)

Answer 1

(6pc-36p²+c²-6pc)-(6pc+4p²-9c²-6pc)=-36p²+c²-4p+9c²=-40p²+10c²=10c²-40p²=10(c²-4p²)

Answer 2

(6p+c)(c-6p)-(2p-3c)(3c+2p)=6pc+12p^2+c-6pc-6pc+4pc^2-9c^2=12p^2+4p^2+c^2-9c^2=16^2-9