Question

please please please do these two sums on copy please please ​

Answer 1

Answer:

13) x×4+1/x×4, answer is (ii)

Answer 2

Explanation:

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

7^2=x^2+1/x^2+2

49-2=x^2+1/x^2

47=x^2+1/x^2

similarly

x^4+1/x^4=47^2-2=2209-2=2207

and question number 14 will go under same procedure so you can try yourself by using formula

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

hope it will help you