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9-69.

For each quadratic function, state the vertex of the parabola.

$f(x) = (x + 3.5)^2 - 10.25$
Answer (a):
The vertex is at $(-3.5, -10.25)$

$f(x) = 3(x + 1)^2 + 1$
Hint (b):
The graphing form of a quadratic (also called the vertex form) is $f(x) = a(x - h)^2 + k$ where the vertex is at $(h, k)$
Answer (b):
The vertex is at $(-1,1)$

$f(x) = (x - 2.5)^2 + 0.75$
Hint (c):
Review hint (b):

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