Question 1200050
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<pre>

All you need for it is to have two expressions equal at s = 5


    c*5 + 3 = c*5^2 - 3,

or

    5c + 3 = 25c - 3

    3 + 3 = 25c - 5c

      6   =   20c

      c   =  {{{6/20}}} = {{{3/10}}} = 0.3.


<U>ANSWER</U>.  c = 3/10 = {{{3/10}}} = 0.3.
</pre>

Solved.