1
Q
An inequality sign reverses when:
A
- multiplying by negative
- dividing by a negative
- taking the reciprocal of both sides
2
Q
absolute value |x| = x when
A
x≥0
3
Q
absolute value |x| = -x when
A
x< 0
4
Q
|ab|
A
|a| × |b|
5
Q
|a|²
A
a²
6
Q
√a²
A
|a|
7
Q
|-a|
A
|a|
8
Q
|a - b|
A
|b - a|
9
Q
|a + b| ≤
A
|a| + |b|
10
Q
Completing the square on a² ± pa
A
a² ± pa + (p/2)²
(a ± p/2)²
11
Q
Quadratic formula
A
x =(−b±√b² − 4ac)
.————
2a
12
Q
|x|=a
A
x=±a
13
Q
|x|<a
A
-a < x < a
14
Q
|x|>a
A
x<-a, x>a
Y11 Math
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