Question

if, x-5=2√(6) .
a)then prove this, x√(x)-1/x(√x )=22(√2 )​

Answer 1

Answer:

If (x+1/x) = 6, what is the value of (X^5+1/x^5)?

15 Answers



Ved Prakash Sharma, former Lecturer at Sbm Inter College, Rishikesh (1971-2007)

Answered February 13, 2018 · Author has 8.3K answers and 4.2M answer views

x+1/x=6 ……………..(1)

Squaring both sides

x^2+1/x^2+2=36

x^2+1/x^2=34 ………..(2)

On cubing eq.(1) both sides

x^3+1/x^3+3.x1/x.(x+1/x)=216

x^3+1/x^3+3×6=216

x^3+1/x^3=216–18

x^3+1/x^3=198………………(3)

Multiply eq.(2) & (3)

(x^2+1/x^2)×(x^3+1/x^3)=34×198

x^5+x+1/x+1/x^5=6732

x^5+6+1/x^5=6732

x^5+1/x^5=6732–6=6726 , Answer