If $ a + \frac{1}{a} = 4$, then what is the value of $a^4 + \frac{1}{a^4}$?

206 194 204 198

194

If $K+\frac{1}{K}=n$ then, $K^2+\frac{1}{K^2}$ = n2 – 2 If $ a + \frac{1}{a} = 4$ $ a^2 + \frac{1}{a^2} = 4^2 - 2 = 14$ $a^4 + \frac{1}{a^4}$ = 14^2 - 2 = 194