# How do you find the y intercept, axis of symmetry and the vertex to graph the function #f(x)=x^2-4x-5#?

See explanation

Using a shortcut trick the use of which depends on the structure of the quadratic.

Consider the standard form of

Write as

Then the y-intercept is

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Given:

Now all you need to do is substitute for

I will let you do that!

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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