Question

11. If 6 2 of a
a number is 6, find the number.

Answer 1

Answer:

a+a1=6

Squaring both sides,

=(a+a1)2=62

=a2+(a1)2+2(a)(a1)=36

=a2+a21+2=36

=a2+a21=34

Now,

(a−a1)2=a2+a21−2(a)(a1)

                         =34−2

                         =32

=>a−a1=±32

                    =±42