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1/(√2+√3)

why is this equal to √3 − √2

 Jan 7, 2016
 #1
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Simplify the following:
1/(sqrt(2)+sqrt(3))

Multiply numerator and denominator of 1/(sqrt(2)+sqrt(3)) by sqrt(2)-sqrt(3):
(sqrt(2)-sqrt(3))/((sqrt(2)+sqrt(3)) (sqrt(2)-sqrt(3)))

(sqrt(2)+sqrt(3)) (sqrt(2)-sqrt(3)) = sqrt(2) sqrt(2)+sqrt(2) (-sqrt(3))+sqrt(3) sqrt(2)+sqrt(3) (-sqrt(3)) = 2-sqrt(6)+sqrt(6)-3 = -1:
(sqrt(2)-sqrt(3))/(-1)

Multiply numerator and denominator of (sqrt(2)-sqrt(3))/(-1) by -1:
-(sqrt(2)-sqrt(3))

-(sqrt(2)-sqrt(3)) = sqrt(3)-sqrt(2):
Answer: | sqrt(3)-sqrt(2)

 Jan 7, 2016

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