Question 310981
Think of the process as a simple case:
{{{(7 + 1)*(7 - 1)}}}
This is obviously {{{8*6 = 48}}}
but you can do it like this also:
{{{49 + 7 - 7 - 1 = 48}}}
All I'm doing is
{{{(a + b)*(a - b) = a^2 + ba + ab - b^2}}}