# How do you evaluate xy - z, when x = 3, y = 5 and z = -7?

Simply enter every value into the expression.

Subtracting a negative is equivalent to adding, so in the case of a double negative, you add.

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[ xy - z = (3)(5) - (-7) ]

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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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