What is the axis of symmetry of the graph of $y = x^2-3x+9$ ?

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Answer 1 · 2018-07-11T21:35:29

$x = 3/2$ or $1.5$

To find the axis of symmetry of a standard quadratic equation $(y = ax^2 + bx + c)$ , we use the formula $x = (-b)/(2a)$ .

We know that $a = 1$ and $b = -3$ , so let's plug them into the formula:
$x = (-(-3))/(2(1)) = 3/2$

Since the axis of symmetry is a line, it is $x = 3/2$ or $1.5$ .

Hope this helps!

What is the axis of symmetry of the graph of y = x^2-3x+9y = x^2-3x+9?