What is the axis of symmetry of the following function?

f (x) = х^2 - 3x - 9

Answer: x=1.5

Step-by-step explanation: The equation is in In a standard form of equation as;

y = ax^2 + bx + c, and therefore, the axis of symmetry is given by the formula,

X = - b / 2a.

Therefore using that in the question, a = 1 and b = - 3.

Therefore, the axis of symmetry is:

x = - (-3) / 2 (1) which gives

x = 3/2 or x=1.5