Question

If x=3+√2 then find the value of x3+1/x3

Answer 1

Answer:

**UR=UNDER ROOT

x=3+UR2

x³=(3+UR2)³

3³+UR2³+2(3)²(UR2)+2(3)(UR2)²

9+2UR2+18UR2+12

x³=21+20UR2

1/x³=1/21+20UR2

RATIONALIZE THE DENOMINATOR

AND SUBTRACT BITH THE VALUES