1.
If x=
and x + 5, find : x3 +
1
x²
5-x​

1 thought on “1.<br />If x=<br />and x + 5, find : x3 +<br />1<br />x²<br />5-x​”

1. Answer:

   Given :

   ( x + 1 /x ) = 5

   We need to find x2 + 1 / x2

   ( x + 1 / x )2 = 25

   = x2 + 1 / x2 + 2 (x)(1/x) = 25

   = x2 + 1/x2 + 2 = 25

   = x2 + 1 / x2 = 25 – 2

   = x2 + 1 / x2=23

   Hence x2 + 1 / x2 = 23Step-by-step explanation:

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