Question

if x+1/x=4 find the value of x3+1/x3 =

7

8

-7

-8

quick​​

Answer 1

Step-by-step explanation:

X+ 1/X =4

(X +1/X)³=4³

X³+ 1/X³ +3X²×1/X +3X×1/X²=64

X³+1/X³+3X +3/X²=64

X³+1/X³+3(X+1/X)=64

X³+1/X³ +3(4)=64

X³+1/X³+12 =64

x³+1/x³ =52

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