if a+1/a = 3 then a³+1/a³=?
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Answer:
Step-by-step explanation:
3³= 27
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(a + 1/a)³ =(3)³
=> a³ + 1/a³+ 3*a*1/a (a+1/a) = 27
=> a³ + 1/a³ + 3* 3 = 27
=> a³ + 1/a³ + 9 = 27
=> a³ + 1/a³ = 27 - 9
=> a³ + 1/a³ = 18
=> a³ + 1/a³+ 3*a*1/a (a+1/a) = 27
=> a³ + 1/a³ + 3* 3 = 27
=> a³ + 1/a³ + 9 = 27
=> a³ + 1/a³ = 27 - 9
=> a³ + 1/a³ = 18
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