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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
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135 week 10..notebook March 29, 2017
simpilfy
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135 week 10..notebook March 29, 2017
always positive AS IS
could be negative!!!
not real!
=3
4
absolute value to the rescue
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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
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NO
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135 week 10..notebook March 29, 2017
F O I L
x 2 conjugates
x + 18
F O I L
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135 week 10..notebook March 29, 2017
sloppy is bad!
Review Quiz 9
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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