Question

If x + 1/x. =4 then calculate the value ofx2 +1|/x2

Answer 1

Step-by-step explanation:

x+1/x=4

then, x2+1/x2=?

so,

(x+1/x) ^2=(4)^2

=> (x2) +(2×x×1/x)+(1/x2)=16

so , x and 1/x will be eliminated....

then,

x2+2+1/x2=16

x2+1/x2=16-2

x2+1/x2=14.