Odpowiedź:
[tex](2+3\sqrt{5})^2=(2+3\sqrt{5})(2+3\sqrt{5} )=4+2*3\sqrt{5} +3\sqrt{5}*2+9*5=4+6\sqrt{5} +6\sqrt{5} +45=49+12\sqrt{5}[/tex]
[tex](3-2\sqrt{2})^2=(3-2\sqrt{2})(3-2\sqrt{2} )=9-3*2\sqrt{2} -2\sqrt{2}*3+4*2=9-6\sqrt{2} -6\sqrt{2} +8=17-12\sqrt{2}[/tex]
można też obliczyć z wzorów skróconego mnożenia:
[tex](a+b)^2=a^2+2ab+b^2[/tex] ----> [tex](2+3\sqrt{5})^2=4+12\sqrt{5} +45=49+12\sqrt{5}[/tex]
[tex](a-b)^2=a^2-2ab+b^2[/tex] ----> [tex](3-2\sqrt{2})^2=9-12\sqrt{2} +8=17-12\sqrt{2}[/tex]
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Odpowiedź:
[tex](2+3\sqrt{5})^2=(2+3\sqrt{5})(2+3\sqrt{5} )=4+2*3\sqrt{5} +3\sqrt{5}*2+9*5=4+6\sqrt{5} +6\sqrt{5} +45=49+12\sqrt{5}[/tex]
[tex](3-2\sqrt{2})^2=(3-2\sqrt{2})(3-2\sqrt{2} )=9-3*2\sqrt{2} -2\sqrt{2}*3+4*2=9-6\sqrt{2} -6\sqrt{2} +8=17-12\sqrt{2}[/tex]
można też obliczyć z wzorów skróconego mnożenia:
[tex](a+b)^2=a^2+2ab+b^2[/tex] ----> [tex](2+3\sqrt{5})^2=4+12\sqrt{5} +45=49+12\sqrt{5}[/tex]
[tex](a-b)^2=a^2-2ab+b^2[/tex] ----> [tex](3-2\sqrt{2})^2=9-12\sqrt{2} +8=17-12\sqrt{2}[/tex]