Solve and write the solution set in interval notation.
-Find the vertex of the graph of $f(x) = -4x^2 + 12x + 7$ and determine whether the graph opens upward or downward.

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The Answer of Solve and write the solution set in interval notation.
-Find the vertex of the graph of $f(x) = -4x^2 + 12x + 7$ and determine whether the graph opens upward or downward.

Solve and Write the Solution Set in Interval Notation f(x)=−4x2+12x+7f(x) = -4x^2 + 12x + 7f(x)=−4x2+12x+7

Solve and Write the Solution Set in Interval Notation $f(x) = -4x^2 + 12x + 7$