Write in Simplest Exponent Form $4 ^ { 6 } x ^ { 2 }$

Multiple Choice

Write in simplest exponent form.
-4 ·4 ·4 ·4 ·4 ·4 · x · x

A) $4 ^ { 6 } x ^ { 2 }$
B) $6 ^ { 4 } x ^ { 2 }$
C) $24 x ^ { 2 }$
D) $4^5 x ^ { 2 }$