5ax=9-4sqrt(5)" find "m^(2)+(1)/(n^(2))quad 12*" What "

If x = 9 - 4sqrt(5) , find the value of x^(2) +(1)/(x^(2)) .

(9+4sqrt(5))^(x)+(9-4sqrt(5))^(x)=18, then find x^(2)-(1)/(x^(2))

a=9-4sqrt(5),sqrt(a)-(1)/(sqrt(a))=?

a=9-4sqrt(5) , sqrt(a)-1/sqrt(a)=?

If (9+4sqrt(5))^(x)+(9-4sqrt(5))^(x)=18 then the value of x^(2)-(1)/(x^(2))

M=sqrt(3-sqrt5+sqrt(9-4 sqrt5)) and N =sqrt(sqrt7-1-sqrt(11-4sqrt7)) What is the value of (M-N)/(M+N) ?

If a=9-4sqrt5 , then find the value of a-1/a

Which of the following expressions are not polynomials? x^(2)+2x^(-2) (ii) sqrt(ax)+x^(2)-x^(3)3y^(3)-sqrt(5y)+9( iv) ax^((1)/(2))+ax+9x^(2)+43x^(-2)+2x^(-1)+4x+5