# Question: 1 is the expression 2x 3 positive or...

###### Question details

1. Is the expression − |2x − 3| positive or negative? Assume the expression is not zero. Explain.

2. In the following expression make the substitution x = −3. Do not simplify your answer. Just show the first step in substituting in −3 for x. −x2 − 2x + 1

3. In the following expression make the substitutions x = 2 and y = −1. Do not simplify your answer. Just show the first step in substituting in 2 for x and −1 for y. 2xy − y2

4. In the following expression convert all subtraction operations to addition. Do not simplify your answer. Just convert subtraction to addition. −3x − (−2) + (−4x) − x 12. In the following expression convert all subtraction operations to addition. Do not simplify your answer. Just convert subtraction to addition. −x2 − 3x + (−7y)

5. Give a specific example of subtracting two negative numbers that simplifies to a positive number. 6. Give a specific example of subtracting two negative numbers that simplifies to a negative number

6. Explain why −42 is −16 and not 16. Your answer must be a complete

sentence.

7. Explain why (−4)2 is 16 and not −16. Your answer must be a complete

sentence