Determine whether the given quadratic function has a minimum value or maximum value. Then find the coordinates of the minimum or maximum point.
f(x) = -x2 - 2x - 6
for critical point
x = 2/-2
x = -1
now for maximum or minimum value, we take dervative of -2x-2
as second derivative is less than zero, so at x=-1 lies a maximum point at
x = -1 , y = -5
function has maximum value at (-1,-5)
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