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  LiveWire / Teen Forums / School & Homework Connection / Viewing Topic

Multiplying Radicals
Replies: 13 — Last Post Dec. 7, 2008 10:05pm by JudeLaurence
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( KRNsoccerplayer24 )


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I got a problem that is squareroot -81 multiplied by squareroot -25

i dun get how to do it...i thought the answer would be 45

9:49 pm on Dec. 7, 2008 | Joined: Oct. 2004 | Days Active: 467
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bstodge


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81x25=2025

square root of 2025=???

???=answer

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So?

9:51 pm on Dec. 7, 2008 | Joined: April 2008 | Days Active: 253
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Noraa


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There's no such thing as the square root of a negative number, it's an imaginary number.

So you get i*i which would be i squared.

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9:51 pm on Dec. 7, 2008 | Joined: Sep. 2007 | Days Active: 387
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Dylan6405


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Its 1 AM FUCK MATH

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9:51 pm on Dec. 7, 2008 | Joined: July 2007 | Days Active: 346
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The Wolfhound


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That would be

sqrt (-81) * sqrt (-25) = sqrt (81*25) = 9*5 = 25

Clear?

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Topic closed.

9:52 pm on Dec. 7, 2008 | Joined: Oct. 2008 | Days Active: 149
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( KRNsoccerplayer24 )


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Quote: from dylan6405 at 9:51 pm on Dec. 7, 2008
Its 1 AM FUCK MATH

I got exams dude...college...its hard...i need to study...

9:52 pm on Dec. 7, 2008 | Joined: Oct. 2004 | Days Active: 467
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Days Of The New


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well i suck at math it came to me when i did it and i forgot it so sorry

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9:53 pm on Dec. 7, 2008 | Joined: Sep. 2008 | Days Active: 242
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hubbabubba52


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25..its like the easiset problem ever..
9:53 pm on Dec. 7, 2008 | Joined: Nov. 2008 | Days Active: 37
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Noraa


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Quote: from The Wolfhound at 9:52 pm on Dec. 7, 2008
That would be  

sqrt (-81) * sqrt (-25) = sqrt (81*25) = 9*5 = 25

Clear?

No, because sqrt of a negative is an imaginary!

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all the days were a sun-drenched haze
while the salt spray crusted on the windowpanes...
9:53 pm on Dec. 7, 2008 | Joined: Sep. 2007 | Days Active: 387
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The Wolfhound


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College? You're kidding me, right? You're doing THIS in college? This is going to be easier than I thought...

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Topic closed.
9:53 pm on Dec. 7, 2008 | Joined: Oct. 2008 | Days Active: 149
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JudeLaurence


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sqrt(-81) = 9i
sqrt(-25) = 5i
9i * 5i = 45i^2 = -45

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9:55 pm on Dec. 7, 2008 | Joined: April 2004 | Days Active: 1,388
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( KRNsoccerplayer24 )


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Quote: from The Wolfhound at 9:53 pm on Dec. 7, 2008
College? You're kidding me, right? You're doing THIS in college? This is going to be easier than I thought...


Im in really low math thats why..not so great at it.

10:00 pm on Dec. 7, 2008 | Joined: Oct. 2004 | Days Active: 467
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( KRNsoccerplayer24 )


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Quote: from DarkLink224 at 9:55 pm on Dec. 7, 2008
sqrt(-81) = 9i
sqrt(-25) = 5i
9i * 5i = 45i^2 = -45

would it be 45i^2

10:02 pm on Dec. 7, 2008 | Joined: Oct. 2004 | Days Active: 467
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JudeLaurence


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i is the sqrt(-1), so i^2 = -1.

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Please change your signature.
10:05 pm on Dec. 7, 2008 | Joined: April 2004 | Days Active: 1,388
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