giup giai pt voi

H

hthtb22

Viết lại đề bài
$\sqrt{(\sqrt{3}+\sqrt{2})^x}+\sqrt{(\sqrt{3}-\sqrt{2})^x}=10$
\Leftrightarrow $(\sqrt{3}+\sqrt{2})^x+(\sqrt{3}-\sqrt{2})^x+2\sqrt{(\sqrt{3}+\sqrt{2})^x.(\sqrt{3}-\sqrt{2})^x}=100$
\Leftrightarrow $(\sqrt{3}+\sqrt{2})^x+(\sqrt{3}-\sqrt{2})^x=98$
Đặt $(\sqrt{3}+\sqrt{2})^x=a;(\sqrt{3}-\sqrt{2})^x=b$
Ta có: $a+b=98; ab=1$
Xong rồi nhá
 
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