[tex](\sqrt{12} -5)(\sqrt{12}+5) = \sqrt{12} *\sqrt{12} +5*\sqrt{12} -5*\sqrt{12}-5*5=\\ 12+5\sqrt{12} -5\sqrt{12} -25=12-25= -13[/tex]
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[tex](\sqrt{12} -5)(\sqrt{12}+5) = \sqrt{12} *\sqrt{12} +5*\sqrt{12} -5*\sqrt{12}-5*5=\\ 12+5\sqrt{12} -5\sqrt{12} -25=12-25= -13[/tex]