# What is the vertex form of #y=(x + 21)(x + 1) #?

For a more detailed explanation of method see the example of

https://tutor.hix.ai .Different values but the method is sound.

Given:

Let

Multiply out giving

Move the power to outside the bracket

Remove the

Multiply

The error introduced is

So

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

So

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The vertex form of the given quadratic function y = (x + 21)(x + 1) is y = (x + 11.5)^2 - 121.25.

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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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