Question

if a + 1/a=9 then find a^3+1/a^3​

Answer 1

Answer:

702

Step-by-step explanation:

$(a + \frac{1}{a} ) {}^{3} - 3 \times a \times \frac{1}{a} (a + \frac{1}{a} ) = {a}^{3 } + \frac{1}{ {a}^{3} } \\ 729 - 3 \times 9 \\ = 702$