Question

find the axis of symmetry for f(x) = x² - 8x + 15. options: x = -4, x = 4, y = 4, y = -4

Explanation:

Step1: Recall axis of symmetry formula

For quadratic $f(x)=ax^2+bx+c$, axis is $x=-\frac{b}{2a}$.

Step2: Identify coefficients

$a=1$, $b=-8$

Step3: Calculate axis value

$x=-\frac{-8}{2\times1}=\frac{8}{2}=4$

Answer:

B. $x=4$