Mr. Dupee bought a novel at a bookstore on sale for 20% off its regular price of $29.99. Mr. Edgar bought the same novel at a di
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<h3>Hello!</h3>
In order to find the vertex of a parabola, we use the following formula:
Remember, a parabola looks like so:
Now we know what a and b stand for.
In this case, b is -4, and a is -1:
Simplify:
Divide:
- Hope everything is clear.
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