From Förberedande kurs i matematik 2

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-	{{NAVCONTENT_START}}	+	The numerator can be factorized using the formula for the difference of two squares to give <math>x^2-1=(x+1)(x-1)</math> and then we see that the numerator and denominator have a common factor which we can eliminate
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Current revision

The numerator can be factorized using the formula for the difference of two squares to give \displaystyle x^2-1=(x+1)(x-1) and then we see that the numerator and denominator have a common factor which we can eliminate

\displaystyle \frac{x^{2}-1}{x-1}=\frac{(x+1)(x-1)}{x-1}=x+1\,\textrm{.}