Question

10. Ifx+ 1/x= 4, x2 +1/x2
afe x + 1/x = 4, x2 +1/x2
= ?
= ?
a
c
12
15
b 14
d 20

(x
+ =
=
6
thon​

Answer 1

Answer:

14

Step-by-step explanation:

x+1/x=4

squaring both sides

x^2+1/x^2+2×x×1/x=16

x^2+1/x^2+2=16

x^2+1/x^2=14