Question 3957
not sure what you are doing here, but it is way off. Too much. Too much :-)


Your H, L and W definitions are spot on, but it says the base area = 84. The base area = LW, so (x-3)(x+5)=84. Multiplying this out gives 


{{{x^2 + 2x - 15 = 84}}}
{{{x^2 + 2x - 99 = 0}}}
(x+11)(x-9) = 0


so x+11 = 0 OR x-9=0


so x=-11 or x=9


So, out solution is the x=9, since we are after a height.


jon.