I know they're all called f, but we're gonna just assume they are different functions. Well, when t is equal to five, five minus five squared is just zero. Make sure we see that, so this is negative one right over here, negative one.
So factored form is definitely what you want when you're trying to find the zeros. Parabolas have two equation forms — standard and vertex.
So it's not too hard to figure out, but there's going to be some calculation in my head. Parabolas may open upward or downward and vary in "width" or "steepness", but they all have the same basic "U" shape.
The steps that we use in this section for completing the square will look a little different, because our chief goal here is not solving an equation. These functions were just written in different ways.
So, we could say t What is f of five? But here for this last one, and this is known as standard form, if I say x equals zero that term disappears, that term disappears and I'm just left with m of zero is equal to negative