Sign in
Please select an account to continue using cracku.in
↓ →
$$ If a + \frac{1}{a} = 1, $$ find the value of $$ a^{3} + \frac{1}{a^{3}} $$
Given, $$a + \frac{1}{a} = 1$$
Cubing on both sides we get,
$$a^{3} + \frac{1}{a^{3}} + 3(a + \frac{1}{a}) = 1$$
$$ a^{3} + \frac{1}{a^{3}} = -2$$ ( as we know $$a + \frac{1}{a} = 1$$)
Hence, option B is the correct answer.
Create a FREE account and get: