Question 92362
12w^2 + 19w + 4

= 12z^2 + 3z + 16z + 4
= 3z(4z + 1) + 4(4z + 1)
= (4z+1)(3z + 4)

Thus 12w^2 + 19w + 4 = (4z+1) (3z + 4)