Question

Question no. 7 plz send it's urgent

Answer 1

Answer:

Step-by-step explanation:

(1) if x ² + 1 / x ² = 27

find x + 1 /x

squaring them

( x +1/x )² = x ² + 1 / x ² + 2 . x . 1/x

( x +1/x )² = x ² + 1 / x ² + 2

( x +1/x )² = 27 + 2

( x +1/x ) = ±√29

(2) if x ² + 1 / x ² = 27

( x -1/x )² = x ² + 1 / x ² -2 . x . 1/x

( x - 1/x )² = 27 - 2

( x -1/x )² = 25

x - 1/x = √25

x - 1/x = 5