alanforde800Maximus wrote:

2^x = 7, then 2^2x =?

A) 49

B) 7

C) 128

D) 64

E) 32

Please assist with above problem.

Dear

alanforde800Maximus,

I'm happy to respond.

Here, we have to be comfortable with the

laws of exponents. For example, A^(pq) = (A^p)^q. That's a very important patterns to know.

Here, 2^(2x) can be rewritten as (2^x)^2. Since, we know that 2^x = 7, we know that (2^x)^2 = 49. Answer =

(A).

Here are some

GMAT Math Flashcards you might find helpful.

Does this make sense?

Mike

_________________

Mike McGarry

Magoosh Test Prep

Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)