Answer:
Step 2 is incorrect.
In step 2, instead of using this rule:
(nᵃ)ᵇ = nᵃ ˣ ᵇ
Carlos used this rule instead:
nᵃ × nᵇ = nᵃ ⁺ ᵇ
That's why it resulted to 4² instead of 4⁻¹⁵
So step 2 must be like
[tex]\frac{4^{-15} }{4^{11} }[/tex]
Now for the rest of solving,
4⁻¹⁵ ÷ 4¹¹ = 4⁻¹⁵ ⁻ ¹¹ = 4⁻²⁶ = [tex]\frac{1}{4^{26} }[/tex]
Cheers
