The depth, d , in inches of the water in a tidal pool, is modeled by the function d=−2x2+12x+7, where x is the number of hours s
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Given equation is 
In general solution of
is 
and 
So the solution of given equation is
and 
Now difference between them is 30.
So we can write
On squaring both side
In general solution of
So the solution of given equation is
Now difference between them is 30.
So we can write
On squaring both side