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A parabola opening up or down has vertex $(0,-2)$ and passes through $(-8,6)$ . Write its equation in vertex form. $\newline$ Simplify any fractions.

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Write a quadratic function from its vertex and another point

Full solution

Q. A parabola opening up or down has vertex

(0,-2)

and passes through

(-8,6)

. Write its equation in vertex form.

\newline

Simplify any fractions.

Vertex Form: What is the vertex form of the parabola? $\newline$ Vertex form of parabola: $y = a(x - h)^2 + k$
Equation at Vertex: What is the equation of a parabola with a vertex at $(0, -2)$ ? $\newline$ Substitute $0$ for $h$ and $-2$ for $k$ in vertex form. $\newline$ $y = a(x - 0)^2 + (-2)$ $\newline$ $y = ax^2 - 2$
Substitute Values: $y = ax^2 - 2$ $\newline$ Replace the variables with $(-8, 6)$ in the equation. $\newline$ Substitute $-8$ for $x$ and $6$ for $y$ . $\newline$ $6 = a(-8)^2 - 2$ $\newline$ $6 = 64a - 2$
Solve for $a$ : $6 = 64a - 2$ $\newline$ Solve for $a$ . $\newline$ $6 = 64a - 2$ $\newline$ $8 = 64a$ $\newline$ $\frac{8}{64} = a$ $\newline$ $\frac{1}{8} = a$
Equation with $a=\frac{1}{8}$ : $y = ax^2 - 2$ $\newline$ What is the equation of parabola if $a = \frac{1}{8}$ ? $\newline$ Substitute $\frac{1}{8}$ for $a$ . $\newline$ $y = \left(\frac{1}{8}\right)x^2 - 2$ $\newline$ Vertex form of parabola: $y = \left(\frac{1}{8}\right)x^2 - 2$

More problems from Write a quadratic function from its vertex and another point

Question

Solve by completing the square.

\newline

m^2 - 10m - 29 = 0

\newline

Write your answers as integers, proper or improper fractions in simplest form, or decimals rounded to the nearest hundredth.

\newline

`m` = ____ or `m` = _____

Posted 9 months ago

Question

g(x)

g(x)

is the translation

5

f(x)=x^2

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Write your answer in the form

a(x–h)^2+k

a

h

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\newline

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Question

What is the range of this quadratic function?

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\newline

\newline

\left\{y \mid y \geq 2\right\}

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\left\{y \mid y \geq 0\right\}

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\text{all real numbers}

Posted 6 months ago

Question

Write the equation of the parabola that passes through the points

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(2,0)

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. Write your answer in the form

y = a(x – p)(x – q)

a

p

q

are integers, decimals, or simplified fractions.

\newline

Posted 6 months ago

Question

Complete the square. Fill in the number that makes the polynomial a perfect-square quadratic.

\newline

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h

\newline

h^2 + 39h = 0

\newline

\newline

Write each solution as an integer, proper fraction, or improper fraction in simplest form. If there are multiple solutions, separate them with commas.

\newline

h =

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Posted 6 months ago

Question

Write a quadratic function with zeros

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Write your answer using the variable

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f(x) = \_\_\_\_\_

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Find the equation of the axis of symmetry for the parabola

y = x^2

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Simplify any numbers and write them as proper fractions, improper fractions, or integers.

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\underline{\hspace{3cm}}

Posted 6 months ago

Question

g(x)

g(x)

is the translation

8

f(x) = x^2

\newline

Write your answer in the form

a(x – h)^2 + k

a

h

k

\newline

g(x) =

\newline

Posted 6 months ago

Question

x

\newline

x^2 = 1

\newline

\newline

Write your answer in simplified, rationalized form.

\newline

x =

x =

\newline

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