The answers to 13 and 20 and how there done.

The sum and product of two functions and , i.e. and respectively, are simply defined as the sum and product of the expressions that define each function.

So, as for exercise 13, we have

Similarly, as for exercise 20, we have

3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

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