А)(2x+y)^2+(x-3y)(x+3y) Б)(c-3)^2+(2+c)(2-c)-3(4-2c)

Question

А)(2x+y)^2+(x-3y)(x+3y)
Б)(c-3)^2+(2+c)(2-c)-3(4-2c)

Answer 1

A) (2x+y)^2+(x-3y)(x+3y)=4x^2+4xy+y^2+x^2-9y^2=5x^2+4xy+8y^2
Б) (c-3)^2+(2+c)(2-c)-3(4-2c)=c^2-6c+9+4-c^2-12+6c=1