# What is the equation of the line normal to #f(x)=x^2+8x - 1# at #x=5#?

and:

The equation of the normal line is of the form:

So the equation of the normal line is:

graph{(y+x/18-1157/18)(x^2+8x-1-y)=0 [-180, 180, -90, 90]}

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The equation of the line normal to f(x)=x^2+8x - 1 at x=5 is y = -1/18(x-5) + 61/18.

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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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