How do you get 3/sqrt2 from 3sqrt2/2?
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Mar 17, 2008 #3 Math Is Hard Staff Emeritus Science Advisor Gold Member 4,491 28 hint: sqrt2/sqrt2 = 1
Mar 17, 2008 #5 Integral Staff Emeritus Science Advisor Gold Member 7,184 55 Try going the other way. Start with [tex] \frac 3 {\sqrt 2} [/tex] to get [tex] \frac {3 \sqrt 2} 2 [/tex]
Try going the other way. Start with [tex] \frac 3 {\sqrt 2} [/tex] to get [tex] \frac {3 \sqrt 2} 2 [/tex]
Mar 17, 2008 #6 Feldoh 1,341 3 If you're going from 3sqrt2/2 to 3/sqrt2 you're basically de-rationalizing the denominator.
Mar 18, 2008 #7 HallsofIvy Science Advisor Homework Helper 41,732 893 By definition [itex](\sqrt{2})^2= \sqrt{2}\sqrt{2}= 2[/itex]. That means that [tex]\frac{\sqrt{2}}{2}= \frac{\sqrt{2}}{\sqrt{2}\sqrt{2}}[/tex]
By definition [itex](\sqrt{2})^2= \sqrt{2}\sqrt{2}= 2[/itex]. That means that [tex]\frac{\sqrt{2}}{2}= \frac{\sqrt{2}}{\sqrt{2}\sqrt{2}}[/tex]
Mar 21, 2008 #8 Air 202 0 Ry122 said: How do you get 3/sqrt2 from 3sqrt2/2? Click to expand... [itex]\frac{3}{\sqrt 2} . \frac{\sqrt 2}{\sqrt 2} = \frac{3 \sqrt 2}{2}[/itex]. This is rationalising the denominator as you cannot have a surd on the denominator. The question that you are asking is how you get the reverse, de-rationalising the denominator. Try opposite steps to the one I shown.
Ry122 said: How do you get 3/sqrt2 from 3sqrt2/2? Click to expand... [itex]\frac{3}{\sqrt 2} . \frac{\sqrt 2}{\sqrt 2} = \frac{3 \sqrt 2}{2}[/itex]. This is rationalising the denominator as you cannot have a surd on the denominator. The question that you are asking is how you get the reverse, de-rationalising the denominator. Try opposite steps to the one I shown.