Answer:
[tex]( x + 15)(x-15)[/tex]
Step-by-step explanation:
[tex]x^2-225[/tex]
[tex]\mathrm{Rewrite\:}225\mathrm{\:as\:}15^2[/tex]
[tex]=x^2-15^2[/tex]
[tex]\mathrm{Apply\:Difference\:of\:Two\:Squares\:Formula:\:}x^2-y^2=\left(x+y\right)\left(x-y\right)[/tex]
[tex]x^2-15^2=\left(x+15\right)\left(x-15\right)[/tex]
[tex]\mathrm{\left(x+15\right)\left(x-15\right)}[/tex]
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