PLEASE HELP!!! Which equation is relevant to 4^x^+^3=64

Answer:
[tex]\large\boxed{2^{2x+6}=2^6}[/tex]
Step-by-step explanation:
[tex]4^{x+3}=64\\\\4^{x+3}=4^3\\\\(2^2)^{x+3}=(2^2)^3\qquad\text{use}\ (a^n)^m=a^{nm}\\\\2^{2(x+3)}=2^{(2)(3)}\\\\2^{2x+6}=2^6[/tex]