Which expression is equivalent too the expression shown

Answer:
[tex]4^{6}[/tex]
Step-by-step explanation:
Using the rule of exponents
[tex]a^{m}[/tex] × [tex]a^{n}[/tex] ⇔ [tex]a^{(m+n)}[/tex] , thus
4² × [tex]4^{4}[/tex] = [tex]4^{(2+4)}[/tex] = [tex]4^{6}[/tex]