Question

tell me answer I will mark as brainliest​

Answer 1

Answer:

(A) under root 140

Step-by-step explanation:

x + 1/x = 12

S.B.S

(X+1/X)^2  = (12)^2

X^2 + 1/X^2 + 2(X)(1/X) = 144

X^2 + 1/X^2 + 2 = 144

X^2 + 1/X^2 = 142  ---- (1)

NOW  

X- 1/X

S.B.S

(X - 1/X)^2   = X^2 + 1/X^2 - 2(X)(1/X) = 142 -2 = 140 [USING (1) ]

(X - 1/X )^2 = 140

(X - 1/X) = UNDER ROOT 140