9514 1404 393
Answer:
the bases are different
Step-by-step explanation:
It is useful to remember that an exponent signifies repeated multiplication:
12² = 12×12 . . . . 2 factors of 12
11³ = 11×11×11 . . . 3 factors of 11
In the product ...
12² × 11³ = 12×12×11×11×11
there are no factors that are repeated 2+3=5 times. It makes no sense to add any exponents in this product.