Find the equation of the axis of symmetry of the following parabola algebraically.

y, equals, minus, 2, x, squared, plus, 8, x, plus, 6
y=−2x
2
+8x+6

1 answer

To find the equation of the axis of symmetry for the given parabola represented by the equation \( y = -2x^2 + 8x + 6 \), we can use the formula for the axis of symmetry for a quadratic function of the form \( y = ax^2 + bx + c \). The formula for the axis of symmetry is given by:

\[ x = -\frac{b}{2a} \]

In the given equation, we identify the coefficients:

  • \( a = -2 \)
  • \( b = 8 \)
  • \( c = 6 \) (we won't use this for the axis of symmetry calculation).

Now, we substitute the values of \( a \) and \( b \) into the formula:

\[ x = -\frac{8}{2 \cdot -2} \]

Calculating the denominator:

\[ 2 \cdot -2 = -4 \]

Now, substituting this back into the equation gives:

\[ x = -\frac{8}{-4} \] \[ x = 2 \]

Thus, the equation of the axis of symmetry for the parabola is:

\[ x = 2 \]