24.If a=1/(a-5) , then a-1/a=?
a) 4
b) 3
c) √5
d) 5
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Answer:
4
Step-by-step explanation:
(a-3) - 1/(a-3) = 5-3 = 2
∴ (a-3)3-1/(a-3)3
=[(a-3)-1/(a-3)]3+3(a-3) 1/(a-3)
[(a-3)-1/(a-3)]
=23+3(2) =4
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