Question

$\sqrt\frac{16 ^{10}+4^{10}}{16^{4}+4^{18}} }$

a)4
b)16
c)64
d)25
e)42

Answer 1

Oi Luis

(16^10 + 4^10)/(16^4 + 4^18) = (4^20 + 4^10)/(4^8 + 4^18) 

(4^20 + 4^10)/(4^8 + 4^18) = 4^10*(4^10 + 1)/4^8*(4^10 + 1) 

= 4^10/4^8 = 4^2 = 16 

√16 = 4 (A)