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The formula for the vertex form is:

f(x) = a(x-h)^2 + k

Where (h,k) is the vertex.

The equation also tells us the direction of opening, which is the a value, in this case opens up because a is positive. It tells us the step pattern, which when a is equal to one is always 1,3,5. However, when the a value is a number other than one, you muct multiply the value by 1,3,5.

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Q: What is the vertex form of a quadratic equation?
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