Respuesta :

3x^2 + 3yx + 6xy +6y^2.
= 3x^2 + 6y^2 + 9 xy

(x+2y)(3x+3y)

Multiply the brackets together

(x)(3x)=3x^2

(x)(3y)=3xy

(2y)(3x)=6xy

(2y)(3y)=6y^2

3x^2+3xy+6xy+6y^2

Answer: 3x^2+9xy+6y^2