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If $P +\frac{1}{P}$ = 5, then what is the value of $P^3 +\frac{1}{P^3}$ ? |
110 95 125 120 |
110 |
If x + \(\frac{1}{x}\) = n then, $x^3 +\frac{1}{x^3}$ = n3 - 3 × n
If $P +\frac{1}{P}$ = 5, The value of $P^3 +\frac{1}{P^3}$ = 53 - 3 × 5 = 110 |
