[tex]\bf \cfrac{x^2}{5}-5\\\\
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\textit{using "5" as the common factor, what is the 1st term? say is "n"}
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5\cdot n=\cfrac{x^2}{5}\implies n=\cfrac{x^2}{5\cdot 5}\implies n=\cfrac{x^2}{25}
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thus\qquad 5\left(\frac{x^2}{25}-1 \right)\qquad \qquad \boxed{5\cdot \cfrac{x^2}{25}\implies \cfrac{x^2}{5}}[/tex]
