how do you multiply 4y squared and 4x squared?

Answer 1

could it be 16 (xy)^2

Answer 2

4*4= 16
y*x=xy^2
answer= 16(xy)^2

Answer 3

4y^2*4x^2=14xy^4

Answer 4

(4y^2)(4x^2) = 16x^2y^2