sqrt(-4) * sqrt(-9) =

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TexasRebel
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12:46a, 4/19/16
Have we discussed this one yet?

What's the answer?
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Hunter_812
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12:48a, 4/19/16
6
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MECH Abe
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12:52a, 4/19/16
Sqrt(-4) = 2i
Sqrt(-9) = 3i
2i * 3i = 6(i^2)
6(i^2) = -6

-6
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haircut
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12:52a, 4/19/16
Pretty sure +/- 6

Hope I'm correct by morn. Nite
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John Francis Donaghy
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1:06a, 4/19/16
Clean sheets.
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VinnyTAMU
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In reply to MECH Abe • 3:03a, 4/19/16
quote:
Sqrt(-4) = 2i
Sqrt(-9) = 3i
2i * 3i = 6(i^2)
6(i^2) = -6

-6


Look at me, I have an education!
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AgBass01
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In reply to John Francis Donaghy • 6:35a, 4/19/16
quote:
Clean sheets.
All I saw in title was squirt squirt.
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FriendlyAg
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6:39a, 4/19/16
Boobs
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Max Power
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6:46a, 4/19/16
Eleventy
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Leeman
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In reply to FriendlyAg • 6:55a, 4/19/16
quote:
Boobs
Solves every problem...
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AggieMac06
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7:25a, 4/19/16
Math
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Humorous Username
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7:34a, 4/19/16
Sqrtrs
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boboguitar
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7:54a, 4/19/16
2i * 2i = -4
-2i * -2i = -4
3i * 3i = -9
-3i*-3i = -9

So...sqrt(-4) = +- 2i
sqrt(-9) = +- 3i

Thus the answer is +-6, not just -6
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In reply to boboguitar • 10:30a, 4/19/16
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In reply to [removed post] • 10:30a, 4/19/16
ClickClack
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10:42a, 4/19/16
Isn't it 5i

Nvm thought it was + not *
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Duncan Idaho
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11:14a, 4/19/16
"Imaginary number" more of that liberal clap trap that is trying to make my daughter go to the bathroom with illegal alien trans atheists that deny the 6 day creation or what Obama calls common core.

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Aggie Joe 93
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11:19a, 4/19/16
Since i literally means the sqrt of -1 (or i x i = -1) the answer is not positive.
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aggietony2010
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In reply to boboguitar • 12:21p, 4/19/16
quote:
2i * 2i = -4
-2i * -2i = -4
3i * 3i = -9
-3i*-3i = -9

So...sqrt(-4) = +- 2i
sqrt(-9) = +- 3i

Thus the answer is +-6, not just -6


This. And this isn't one of those ****ing ambiguously written order of operations questions. This is the answer.
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boboguitar
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In reply to Aggie Joe 93 • 12:23p, 4/19/16
quote:
Since i literally means the sqrt of -1 (or i x i = -1) the answer is not positive.


Except the square root operation produces 2 results.
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DifferenceMaker Ag
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12:27p, 4/19/16
Such an irrational post OP.
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TexasRebel
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In reply to DifferenceMaker Ag • 12:32p, 4/19/16
It's not irrational. It's not irrational at all!

Pie sounds real good right now.
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Ag_EE
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In reply to boboguitar • 12:38p, 4/19/16
quote:
quote:
Since i literally means the sqrt of -1 (or i x i = -1) the answer is not positive.


Except the square root operation produces 2 results.

bi-rationals
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Atreides Ornithopter
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In reply to DifferenceMaker Ag • 12:39p, 4/19/16
quote:
Such an irrational post OP.
Get real
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aTmAg
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In reply to boboguitar • 12:40p, 4/19/16
quote:
2i * 2i = -4
-2i * -2i = -4
3i * 3i = -9
-3i*-3i = -9

So...sqrt(-4) = +- 2i
sqrt(-9) = +- 3i

Thus the answer is +-6, not just -6
Wolfram Alpha disagrees.

Just because:
-6 * -6 = 36
6 * 6 = 36
does not mean:
sqrt(-6*-6) = +-6
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In reply to aTmAg • 12:45p, 4/19/16
aTmAg
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In reply to [removed post] • 12:49p, 4/19/16
quote:
So does your calculator, but that's because they only give one solution.
Alpha is not an ordinary calculator. For example it returns -i and i for the solution of x^2+1=0.
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boboguitar
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In reply to aTmAg • 12:54p, 4/19/16
quote:
quote:
2i * 2i = -4
-2i * -2i = -4
3i * 3i = -9
-3i*-3i = -9

So...sqrt(-4) = +- 2i
sqrt(-9) = +- 3i

Thus the answer is +-6, not just -6
Wolfram Alpha disagrees.

Just because:
-6 * -6 = 36
6 * 6 = 36
does not mean:
sqrt(-6*-6) = +-6


I'm sorry?

I'm sure it's treating the square root as a function as most calculators do.
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TexasRebel
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In reply to aTmAg • 12:57p, 4/19/16
WolframAlpha also says {sqrt(4)=-2} is false
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Psych
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12:58p, 4/19/16
Take it to the Chinese board.
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In reply to aTmAg • 1:02p, 4/19/16
GarlandAg2012
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1:06p, 4/19/16
Isn't the defintion of radical(x) the principal square root of the number? If the OP intended sqrt() to equate to the radical, then it should only be the positive root I think.

Edit: TA does not play well with the radical symbol.
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In reply to GarlandAg2012 • 1:10p, 4/19/16
TexasRebel
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In reply to [removed post] • 1:16p, 4/19/16
What?!
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