Question

X2+1/x2=18,find the value of x3+1/x3;x>0

Answer 1

Step-by-step explanation:

X^2 +2/x = 18

x^2 +1/x + 2*x*1/x = 18

x^2 +1/x + 2 = 18

x^2+1/x = 18-2 =16

x + 1/x = 4

we can use the formula to find x^3 +1/x by (x +1/x)^3

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