Ok, so the second derivative is negative and you know that if the 2nd derivative is negative the function is concave downwards.
Of course you should recognize that we are dealing with a quadratic function, a parabola, which opens downwards for all values of x
Determine the open intervals on which the graph of f(x) = -7x^2 + 8x + 1 is concave downward or concave upward.
The second derivative is just -14, so I don't know what to do with that.
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