Answer:
The y-intercept of the quadratic function f(x) is 12.
Step-by-step explanation:
The given function is

At y-axis the value of x is 0.
Substitute x=0 in the given function to find the y-intercept of the function.

On simplification, we get


The graph of function intersect y-axis at (0,12).
Therefore the y-intercept of the quadratic function f(x) is 12.