135 week 10..notebook March 29, 2017
AGENDA
Lecture Radicals 7.17.3
Review Quiz 9
Radicals3 * 3 = 9 square root of 9 is 3.
number that if multiplied by itself you get the number inside the radical
√ 9 = 3 ALWAYS POSITIVE
cubed root = number multiplied by itself 3 times 3 * 3* 3 = 27
135 week 10..notebook March 29, 2017
simpilfy
135 week 10..notebook March 29, 2017
always positive AS IS
could be negative!!!
not real!
=3
4
absolute value to the rescue
135 week 10..notebook March 29, 2017
no absolute value| 3 y | need absolutes to be +
can't take the square root of a negative number!!!x4 > 0 x > 4
x + 5 > 0 x < 5
all numbers
x 4 > 0
135 week 10..notebook March 29, 2017
135 week 10..notebook March 29, 2017
135 week 10..notebook March 29, 2017
NO
135 week 10..notebook March 29, 2017
135 week 10..notebook March 29, 2017
135 week 10..notebook March 29, 2017
135 week 10..notebook March 29, 2017
135 week 10..notebook March 29, 2017
135 week 10..notebook March 29, 2017
F O I L
x 2 conjugates
x + 18
F O I L
135 week 10..notebook March 29, 2017
sloppy is bad!
Review Quiz 9
135 week 10..notebook March 29, 2017
LCD:(u2)(u1)
6(u2)(u1)+5(u1)=2(u2)
6(u23u+2)+5u5=2u+4
6u218u+12 +5u5+2u4=0
6u2 11u +3 =0
AC=18<
6u^2 9u 2u +3
3u(2u3) 1(2u3)
(3u 1) ( 2u 3) = 0