if x = 3+2 root 2, find the value of x2+1/x2 =18
Answers
Answered by
2
Answer:
given
x= 3+2√2
x²= (3+2√2)²
= 9+8+12√2
=. 17+12√2
1/x²= 1/(3+2√2)
= (3-2√2) rationalize
so x²+1/x²= 17+12√2+3-2√2
=. 20+10√2
x²+1/x²= 10(2+√2). ans
Similar questions