[Week 3]- Absolute value of a real number
What I have learned:
- What is the absolute value of a real number
- The absolute value of a real number is defined as the principal square root if the square of a number.
- Determine absolute value.
- The relationship with absolute and principal square root.
- √x ² = |x|
Ex. Determine each absolute value.
|4.2|, |-6.1|, |0|, | -3/4 |
4.2, 6.1, 0, 3/4
Ex. Evaluate√（3-5） 2
Use the fact that √（3-5）2 = |x|
√（3-5）2 = |3-5|