Write the correct inequality (< or >) in each space.
- 2. 10 25 3. 4.
- When does the expression −xrepresent a positivenumber? _____
- An inequality must be “flipped” whenever ___.
- When isx−ynegative? _____
- What is the simple way to tell quickly whether a product, quotient, or power is negative?
- If (x−y)(y−x) =−10, then (x−y)^2 =_____. (Think before doing any algebra!)
Simplify the following expressions withouta calculator.
- If x≠2, then . 13.
11.− 13 y^2 −(− 4 y^2 ) = 14. − 15 −(−9) =
- = 15. −5(−x)^6 ×− 7 x^11 =
- If a(2 −x) > b(2 −x), then
a> bonly if _______________
a< bonly if _______________Solve the following inequalities for x:
17.− 4 x+20 > 16 17. __
- 4x− 20 ≥ 16 18. __
19.− 20 − 4 x< 16 19. __
20.− 4 x−20 > − 16 20. __
2
3
2
− 5
−
−
−
()− ()−
() ()
=
51
25
31643918
18 9
x
x−
−
=
−
2
5
3
5
−
2
5
−
4
7
−
2
5
−
3
5
Concept Review 6: Negatives
292 MCGRAW-HILL’S SAT