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