If (-3)^(2x) = 3^(12 - x) and x is an integer, what is the value of x ?
Choices.
A) 5  B) 4  C) 3  D) 2  E) 1

Rationale: since x is an integer , ( - 3 ) ^ ( 2 x ) is always positive . so , 3 ^ 2 x = 3 ^ ( 12 - x ) 2 x = 12 - x 3 x = 12 x = 4 answer : b
Answer: B