Question

How do you determine the y-intercepts of quadratic functions?

Answer 1

In order to find the y-intercept `b` of any function `f(x)` is `f(0)`.

So, the y-intercept of `f(x)=ax^2+bx+c` is

`f(0)=a(0)^2+b(0)+c=c`.

The constant term c of a quadratic function is always its y-intercept.

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I hope that this was helpful.