Question

Find the value of x square + 1/x square if x - 1/x =4​

Answer 1

Answer:

your answer is 18

Step-by-step explanation:

x^2+1/x^2=(x-1/x)^2+2×x×1/x

x-1/x=4

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

so the answer is 16+2=18

Answer 2

Answer:

18 is the value of x^2+1/x^2

Step-by-step explanation:

Given x-1/x = 4

x^2+1/x^2

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

= (4)^2+2

= 16+2

= 18

The identity used above is

a^2+b^2 = (a-b)^2+2ab

Here a = x ; b = 1/x