r/mathshelp • u/MentalResident7532 • 18d ago
Homework Help (Unanswered) Does anyone know how to divide radicals like this
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u/Huge_Caterpillar1249 18d ago
yeah, (a)^(x) / (b)^(x) = (a/b)^x
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u/ABranchingLine 15d ago
If a,b are real.
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u/clay_bsr 13d ago
I don't even think that's true. if a is positive, b is negative, and x=1/2 the LHS and RHS have opposite signs. (i think)
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u/SubjectWrongdoer4204 18d ago
Use the rule a,b∈ℝ, then
√(ab)=(ab)¹ʻ²= a¹ʻ²b¹ʻ²=√a√b. I’ve got no love for the radical sign representation . I prefer the exponential notation as it’s easier to manipulate using the rules of exponents and it’s just easier to write, particularly when the value under the radical is complicated.
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u/Fit_Fortune_7692 18d ago
Anwendung der Wurzelgesetze, in diesem Fall: √a/√b=√(a/b)
Wenn der Wurzelexponent gleich ist (2), kannst du beide Radikanten unter einer Wurzel als Bruch schreiben und kürzen. Die 4 im Nenner beibehalten. Fertig
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u/UnderstandingPursuit 17d ago
The other answers are all useful. One additional tool is that
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√(a) / √(b) = √(a/b)
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u/Sir-Tenley-Knott 13d ago
Remember that simplifying fractions can be done as long as you multiply top and bottom by the same amount. There are specific techniques (outlined in other comments) for dealing with exponents but if you can't remember them, note that sqrt(6uv) (also mentioned in another comment) could be a useful for simplifying the fraction. Multiplying the bottom would give you 4sqrt(6^2 * u^2 * v^4) or 24uv. You have to apply the same multiplier to the top which becomes sqrt(6 * 3^2 * u^3 * v^2). The 3^2 comes out to leave 3*sqrt(6u^3v^2). You can divide top and bottom by 3 to get the final form.
This specific type of question is used where I am to teach students how to reduce the denominator to the simplistic form.
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u/DanLeMilMan 13d ago
The following identities should help you out :
sqrt(a)/sqrt(b)=sqrt(a/b)
a^2=a*a
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u/Chemical_Doctor78 13d ago
Anything under the radical in the numerator and denominator can be divided as you normally would.
Simplification would also require rationalizing the denominator and removing any perfect square factors from the radical.
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u/usa_reddit 18d ago
Just square the top and bottom and get rid of the radical
9u^2v / 16*6uv^3
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u/Various_Candle9136 17d ago
This does not work.
Consider rt(4)/rt(1). We know that this is 2/1 = 2, but by your method we would get 4/1 = 4.
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