Question 243092
There are two ways to solve this.  


49c^2 -25=0


Factor into
(7c-5)(7c+5)=0


There are two solutions.  


First solution:
7c-5=0
7c=5
c=5/7


Second solution:
7c+5=0
7c=-5
c=-5/7


Dr. Robert J. Rapalje, Retired