Question

Which is a factor of 3x2y2 + 6x2 + 12y2 + 24?

Answer 1

$3x^2y^2+6x^2+12y^2+24\\\\ 3 \times x^2y^2+3 \times 2x^2 + 3 \times 4y^2 + 3 \times 8\\\\ =3(x^2y^2+2x^2+4y^2+8)$