Math, asked by nothingnoting68, 8 months ago

if a+1/a=5 and ab=5 , find a3+1/a3

Answers

Answered by SUB299

1

answer is 110

a3+1/a3 = 5

cube both sides

a3 + 1/a3 + 3(a+1/a) = 125

" + 3*5 = 125

" = 125 - 15

ie. 110

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