Find the Axis of Symmetry y=6x^2-4x-1

$y = 6 x^{2} - 4 x - 1$

Step 1

Rewrite the equation in vertex form.

Complete the square for $6 x^{2} - 4 x - 1$ .

Use the form $a x^{2} + b x + c$ , to find the values of $a$ , $b$ , and $c$ .

$a = 6$

$b = - 4$

$c = - 1$

Consider the vertex form of a parabola.

$a {(x + d)}^{2} + e$

Find the value of $d$ using the formula $d = \frac{b}{2 a}$ .

Substitute the values of $a$ and $b$ into the formula $d = \frac{b}{2 a}$ .

$d = \frac{- 4}{2 \cdot 6}$

Simplify the right side.

Cancel the common factor of $- 4$ and $2$ .

Factor $2$ out of $- 4$ .

$d = \frac{2 \cdot - 2}{2 \cdot 6}$

Cancel the common factors.

Factor $2$ out of $2 \cdot 6$ .

$d = \frac{2 \cdot - 2}{2 (6)}$

Cancel the common factor.

$d = \frac{2 \cdot - 2}{2 \cdot 6}$

Rewrite the expression.

$d = \frac{- 2}{6}$

Cancel the common factor of $- 2$ and $6$ .

Factor $2$ out of $- 2$ .

$d = \frac{2 (- 1)}{6}$

Cancel the common factors.

Factor $2$ out of $6$ .

$d = \frac{2 \cdot - 1}{2 \cdot 3}$

Cancel the common factor.

$d = \frac{2 \cdot - 1}{2 \cdot 3}$

Rewrite the expression.

$d = \frac{- 1}{3}$

Move the negative in front of the fraction.

$d = - \frac{1}{3}$

Find the value of $e$ using the formula $e = c - \frac{b^{2}}{4 a}$ .

Substitute the values of $c$ , $b$ and $a$ into the formula $e = c - \frac{b^{2}}{4 a}$ .

$e = - 1 - \frac{{(- 4)}^{2}}{4 \cdot 6}$

Simplify the right side.

Simplify each term.

Cancel the common factor of ${(- 4)}^{2}$ and $4$ .

Rewrite $- 4$ as $- 1 (4)$ .

$e = - 1 - \frac{{(- 1 (4))}^{2}}{4 \cdot 6}$

Apply the product rule to $- 1 (4)$ .

$e = - 1 - \frac{{(- 1)}^{2} \cdot 4^{2}}{4 \cdot 6}$

Raise $- 1$ to the power of $2$ .

$e = - 1 - \frac{1 \cdot 4^{2}}{4 \cdot 6}$

Multiply $4^{2}$ by $1$ .

$e = - 1 - \frac{4^{2}}{4 \cdot 6}$

Factor $4$ out of $4^{2}$ .

$e = - 1 - \frac{4 \cdot 4}{4 \cdot 6}$

Cancel the common factors.

Factor $4$ out of $4 \cdot 6$ .

$e = - 1 - \frac{4 \cdot 4}{4 (6)}$

Cancel the common factor.

$e = - 1 - \frac{4 \cdot 4}{4 \cdot 6}$

Rewrite the expression.

$e = - 1 - \frac{4}{6}$

Cancel the common factor of $4$ and $6$ .

Factor $2$ out of $4$ .

$e = - 1 - \frac{2 (2)}{6}$

Cancel the common factors.

Factor $2$ out of $6$ .

$e = - 1 - \frac{2 \cdot 2}{2 \cdot 3}$

Cancel the common factor.

$e = - 1 - \frac{2 \cdot 2}{2 \cdot 3}$

Rewrite the expression.

$e = - 1 - \frac{2}{3}$

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$e = - 1 \cdot \frac{3}{3} - \frac{2}{3}$

Combine $- 1$ and $\frac{3}{3}$ .

$e = \frac{- 1 \cdot 3}{3} - \frac{2}{3}$

Combine the numerators over the common denominator.

$e = \frac{- 1 \cdot 3 - 2}{3}$

Simplify the numerator.

Multiply $- 1$ by $3$ .

$e = \frac{- 3 - 2}{3}$

Subtract $2$ from $- 3$ .

$e = \frac{- 5}{3}$

Move the negative in front of the fraction.

$e = - \frac{5}{3}$

Substitute the values of $a$ , $d$ , and $e$ into the vertex form $6 {(x - \frac{1}{3})}^{2} - \frac{5}{3}$ .

$6 {(x - \frac{1}{3})}^{2} - \frac{5}{3}$

Set $y$ equal to the new right side.

$y = 6 {(x - \frac{1}{3})}^{2} - \frac{5}{3}$

Step 2

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

$a = 6$

$h = \frac{1}{3}$

$k = - \frac{5}{3}$

Step 3

Since the value of $a$ is positive, the parabola opens up.

Opens Up

Step 4

Find the vertex $(h, k)$ .

$(\frac{1}{3}, - \frac{5}{3})$

Step 5

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

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

$\frac{1}{4 a}$

Substitute the value of $a$ into the formula.

$\frac{1}{4 \cdot 6}$

Multiply $4$ by $6$ .

$\frac{1}{24}$

Step 6

Find the focus.

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

$(h, k + p)$

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

$(\frac{1}{3}, - \frac{13}{8})$

Step 7

Find the axis of symmetry by finding the line that passes through the vertex and the focus.

$x = \frac{1}{3}$

Step 8

Find the Axis of Symmetry y=6x^2-4x-1

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