View
11
Download
0
Category
Preview:
DESCRIPTION
Algebra II Honors Problem of the Day Homework: p. 33 9 – 11 all, 33-41 all. Given that x is a member of the set of real numbers, name all x that satisfy each of the following equations. Principal Roots for Radicals. - PowerPoint PPT Presentation
Citation preview
Algebra II Honors Problem of the DayHomework: p. 33 9 – 11 all, 33-41 all
Given that x is a member of the set of real numbers,name all x that satisfy each of the following equations.
€
a) x2 =16
b) x2 = −16
c) x3 = 8
d) x3 = −8
e) x2 = 0
€
a) ± 4
b) no real ans.
c) 2
d) − 2
e) 0
Principal Roots for Radicals
When a radical has an even index there are two possible solutions. One positive and one negative.
When a radical has an odd index there is only one possible solution.
€
32 = 9 −3( )2 = 9
€
23 = 8 −2( )3 = −8
Use absolute value symbols on variables when simplifying radical expressions if:
The radical has an even index and the variable that is in the solution has an odd exponent.
€
x8
€
x6
€
x155
Algebra II Honors Problem of the DayHomework: p. 33 12, 23-32 all 61-65 all
Simplify the following:
€
−3x4y5
3−3 x−2y16
⎛
⎝ ⎜
⎞
⎠ ⎟
−2
Rules for Simplifying Radicals
€
abn = an ⋅ bn (note: if n is even, ab must be positive so that an answer is possible)
€
54x4y5 =
€
=3x2y2 6y
€
32 ⋅ 6 ⋅ x4 ⋅ y4 ⋅ y
You might not need to write all of the steps out. Keep in mind you are trying to make sure you don’t leave perfect nth roots inside the radical.
€
96x5y43 =
€
=2xy 12x2y3
€
23 ⋅22 ⋅3⋅x3x2y3y3
€
a
bn =
an
bn
A rule similar to the first one applies to fractions.
€
502
=502
€
=5
€
= 25
Reduce fractions before simplifying.€
5x5
643 =
5x53
643
€
=x 5x23
4
Do the parts individually if the fraction doesn’t reduce
No radicals are allowed in the denominator.
Rationalizing the denominator:
€
1
arn
€
⋅ asn
asn
where r + s = n
Recommended