Question 859771
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Hi,
A = {{{(1/2)bh =  (1/2) (n+6)(n-1) = 49}}}
    (n+6)(n-1) = 98
   n^2 +5n - 6 = 98
   n^2 +5n -104 = 0   tossing out negative solution for unit measure
   (n +13)(x-8) = 0   Factor
         n = 8
0r
   n^2 +5n -104 = 0 
{{{n = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
    {{{n = (-b +- sqrt( 441 ))/(2*a) }}}
     {{{n = (-5+- 21)/(2) }}}  tossing out negative solution for unit measure
               n = 16/2 = 8