may 8, 2014
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Today: Final Exam Review (4)
Review Radical Operations (3) Radical Equations: Definition &
Practice Class Work
May
8
Final Exam Review:
Jennifer’s hand measures 8 inches long. She is 5 ft. 8 inches tall. Express the ratio of the length of Jennifer’s hand to her height in its simplest form.
8% of your total earnings is taken out of each paycheck for taxes. On your last pay check, $42.00 was deducted. How much were your gross (before deductions) earnings last pay period?
$525.00
You take your mom out for a nice lunch to celebrate Mother’s Day. The total comes to $28.00, so you ask your mom if you can borrow $28.00. You plan on leaving a 15% tip. How much do you really need to borrow?
$32.20
final
question
Word ProblemA stadium has a square poster of a
football player hung from the outside wall. The poster has an area of 12,544 ft2. What is the width of
the poster?
112 feet wide
Radical Review: (3)
Class Notes Section of Notebook
Radical Equations
103 x 215)2( x 13 xx9
7162 x
Radicand: Number or expression under the radical symbol.
Radical Equations: NOT Radical Equations:
2 1 1x x
13 x103 x215)2( x
7162 x
x92 1 1x x
Radical Equations
𝟏 .√𝒙+𝟒=𝟏 (√𝒙+𝟒)𝟐=𝟏𝟐
𝒙+𝟒=𝟏𝒙=−𝟑
−𝟒−𝟒
𝟐 .−𝟖+√𝒚+𝟖=𝟎
(√𝒚+𝟖)𝟐=𝟖𝟐
+𝟖+𝟖√𝒚+𝟖=𝟖
𝒚+𝟖=𝟔𝟒−𝟖−𝟖
𝒚=𝟓𝟔
𝟑 .−𝟒√𝟕𝒓+𝟒=−𝟐𝟎
(√𝟕𝒓+𝟒)𝟐=𝟓𝟐
𝟕𝒓+𝟒=𝟐𝟓
𝒓=𝟑
−𝟒−𝟒
−𝟒−𝟒√𝟕𝒓+𝟒=𝟓
𝟕𝒓=𝟐𝟏
(√𝒙+𝟐)𝟐=𝒙𝟐
𝒙+𝟐=𝒙𝟐𝟎=𝒙𝟐−𝒙 −𝟐𝟎=(𝒙−𝟐)(𝒙+𝟏)𝒙=𝟐 𝒙=−𝟏
True
1
√𝟑≠𝟐False
So x=2 ONLY!
Remember: an extraneous solution gives a false statement when checked
7 5x x
Class Work: Due Friday