From Förberedande kurs i matematik 1

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	If we take out the factor 5, we see that the expression can be factorized using the conjugate rule		If we take out the factor 5, we see that the expression can be factorized using the conjugate rule
-	<math> \qquad \begin{align}	+	{{Displayed math||<math>\begin{align}
	5x^2-20&=5(x^4-4)\\		5x^2-20&=5(x^4-4)\\
	&= 5(x^2-2^2)\\		&= 5(x^2-2^2)\\
-	&= 5(x+2)(x-2)	+	&= 5(x+2)(x-2)\,\textrm{.}
-	\end{align}	+	\end{align}</math>}}
-	</math>	+
-	<!--<center> [[Image:2_1_3b.gif]] </center>-->	+
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Current revision

If we take out the factor 5, we see that the expression can be factorized using the conjugate rule

\displaystyle \begin{align} 5x^2-20&=5(x^4-4)\\ &= 5(x^2-2^2)\\ &= 5(x+2)(x-2)\,\textrm{.} \end{align}