Question

question 1 if a=5-√21/2 prove that (a^3+1/a^3)-5(a^2+1/a^2)+(a+1/a)=0

Answer 1

first find the value of a+1/a then find a^2+1/a^2 then follow the given method

Answer 2

thanks you

myself

Ashakiran from class 9th