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A parabola opening up or down has vertex $(0,-7)$ and passes through $(8,1)$ . Write its equation in vertex form. $\newline$ Simplify any fractions.

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Write a quadratic function from its vertex and another point

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Q. A parabola opening up or down has vertex

(0,-7)

and passes through

(8,1)

. Write its equation in vertex form.

\newline

Simplify any fractions.

Identify Vertex Values: We have: $\newline$ Vertex: $(0,-7)$ $\newline$ Identify the values of $h$ and $k$ . $\newline$ Vertex is $(0,-7)$ . $\newline$ $h = 0$ $\newline$ $k = -7$
Select Equation: We have: $\newline$ $y = a(x - h)^2 + k$ $\newline$ $h = 0$ and $k = -7$ $\newline$ Select the equation after substituting the values of $h$ and $k$ . $\newline$ Substitute $h = 0$ and $k = -7$ in $y = a(x - h)^2 + k$ . $\newline$ $y = a(x - 0)^2 - 7$ $\newline$ $y = ax^2 - 7$
Find Value of a: We have: $y = ax^2 - 7$
Point: $(8,1)$
Find the value of a.
$y = ax^2 - 7$
$1 = a(8)^2 - 7$
$1 = 64a - 7$
$1 + 7 = 64a$
$8 = 64a$
$\frac{8}{64} = a$
$a = \frac{1}{8}$
Write Vertex Form: We found: $\newline$ $a = \frac{1}{8}$ $\newline$ $h = 0$ $\newline$ $k = -7$ $\newline$ Write the equation of a parabola in vertex form. $\newline$ $y = a(x - h)^2 + k$ $\newline$ $y = \frac{1}{8}(x - 0)^2 - 7$ $\newline$ Vertex form: $y = \frac{1}{8}x^2 - 7$

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