If | a | = 3, | B | = 4, and | A-B | = A-B, then AB is equal to It's better to have a formula

If | a | = 3, | B | = 4, and | A-B | = A-B, then AB is equal to It's better to have a formula

Ia Bi = A-B, so if A-B is greater than 0, then a is greater than B, then B = - 4, ab = ± 12