Question

if a≠0 and a-1/a=3;find:i)a²+1/a² i
ii)a³-1/a³


plzz help I need the answer

Answer 1

if (a+1/a) 2 = 3, then (a3 + 1/a3)=? ... Therefore, (a 3 + 1/ a 3) = (a + 1/a)3 - 3 x a x 1/a (a + 1/a) = (√3)3 - 3(√3) = 3√3 - 3(√3 = 0. SME Approved ...