[-5] [7] [6] [10]
U is union thus list everything in A and B
ANSWER
C. x=7
EXPLANATION
The given exponential equation is

We rewrite the right hand side as 3 raised to exponent 2.

Observe that the base of both sides of the equation are equal.
We now equate the exponents.

Solve for x,


The correct choice is C.
The answer is 74. The parenthesis is another way of telling you to multiply.