Answer:

3x²+3y²+6xy+4x+4y

Step-by-step explanation:

3(x+y)²+4x+4y

3(x²+y²+2xy)+4x+4y

3x²+3y²+6xy+4x+4y

Answer:

3(x+y)^2 = (3x+3y)^2 [(a+b)^2 = a^2 + b^2 + 2ab]

Step-by-step explanation:

a = 3x , b= 3y

so, (3x)^2 + (3y)^2 + 2(3x)(3y) + 4x + 4y

= 9x^2 + 9y^2 + 18xy + 4x + 4y