Question

If X equal to 3 + root 8 find the value of i)x square + 1 divided by x square; ii)x cube+ 1 divided by x cube ?

Answer 1

Answer:

Step-by-step explanation:

x=3+√8

(i) x²+1/x²

soln:

(3+√8)² +1/(3+√8)²

3²+√8² +1/3²+√8²=9+8+1/9+8

18/17

ans,18/17

(ii)x³+1/x³

soln:

(3+√8)³+1/(3+√8)³=

3³+2+1/3³+2= 27+2+1/27+2

30/29

ans,=30/29