I think this one is doing the rounds, I first saw it here.
is the obvious answer,
, but are there more answers?
This was my approach
A quadratic equation.
Hence,
I then used my calculator

Hence 0r
I think this one is doing the rounds, I first saw it here.
is the obvious answer,
, but are there more answers?
This was my approach
A quadratic equation.
Hence,
I then used my calculator
Hence 0r
Filed under Algebra, Index Laws, Interesting Mathematics, Quadratics, Solving