Folosim formula [tex] a^{2} - b^{2}= (a-b)*(a+b) [/tex]
[tex]( x+ \sqrt{2}) ^{2}-8= ( x+ \sqrt{2}) ^{2}-(2 \sqrt{2} )^{2}=[/tex]
[tex]=(x+ \sqrt{2}-2 \sqrt{2} )*(x+ \sqrt{2}+2 \sqrt{2} )=(x- \sqrt{2} )(x+3 \sqrt{2} )[/tex]
Folosesti aceeasi formula si pt al doilea exercitiu si tii cont ca [tex]27=(3 \sqrt{3} )^{2}[/tex].