Question 5353
{{{m^2-2m-63=0}}}
{{{(m-9)(m+7)= 0 }}}

I chose -9 and 7 because when multiplied together they = -63 and when added together they = -2

Then set each = 0

m-9=0 
Add 9 to both sides to get 
m=9


or m+7=0
subtract 7 from both sides:
m=-7

so your solution is m=9,-7