Question

5. If x-1/x = 4, then evaluate x^2+1/x^2?​

Answer 1

Answer:

18,✓✓✓✓

Step-by-step explanation:

( x - 1/x) =4

squaring both side

(x-1/x)^2 = 16

x ^2 + 1/x^2 -2 •x •1/x = 16

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

x^2 + 1/x ^2 = 18

Answer 2

Step-by-step explanation:

x-1/x=4

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

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

18 = x^2 + 1/x^2