Algebra Examples

$y = 5 {(x - 3)}^{2} + 4$

Step 1

Use the vertex form, $y = a {(x - h)}^{2} + k$ , to determine the values of $a$ , $h$ , and $k$ .

$a = 5$

$h = 3$

$k = 4$

Step 2

Find the vertex $(h, k)$ .

$(3, 4)$

Step 3

Find $p$ , the distance from the vertex to the focus.

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Step 3.1

Find the distance from the vertex to a focus of the parabola by using the following formula.

$\frac{1}{4 a}$

Step 3.2

Substitute the value of $a$ into the formula.

$\frac{1}{4 \cdot 5}$

Step 3.3

Multiply $4$ by $5$ .

$\frac{1}{20}$

Step 4

Find the focus.

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Step 4.1

The focus of a parabola can be found by adding $p$ to the y-coordinate $k$ if the parabola opens up or down.

$(h, k + p)$

Step 4.2

Substitute the known values of $h$ , $p$ , and $k$ into the formula and simplify.

$(3, \frac{81}{20})$

Step 5