The vertex of the parabola is <span><span>(<span>2,1</span>)</span><span>(<span>2,1</span>)</span></span>
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So, the axis of symmetry is the line <span><span>x=2</span><span>x=2</span></span>
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We can calculate the percent change dividing the change by the original amount of people attending the exhibit.
The increase is 298-152 = 146.
Then, we can calculate the percent change as:

There was a 96% increase in the number of people attending the exhibit.
4x^4
so the answer would be
4x^4(18x-20)