Question

if a2+1\a2 and a is not equal to 0 the find (1) a-1\a 920 a3-1\a3

Answer 1

Answer:

Step-by-step explanation:

Answer:

a³+1/a³ = 18

Explanation:

a²+1/a² = 7 -----(1)

=> a²+1/a²+ 2 = 7+2

=> (a+1/a)² = 3²

=> a+1/a = 3 ----(2)

Now ,

a³+1/a³

= (a+1/a)³ - 3(a+1/a)

= 3³ - 3×3

= 27 - 9

= 18