Question

Помогите пожалуйста решить 2 номера
Даю много балов

Answer 1

$1)x^{2}=3\\\\x_{1}=-\sqrt{3}\\\\x_{2}=\sqrt{3}\\\\2)x^{2} =-9\\\\kornei.net\\\\3)\sqrt{x}=25\\\\x=25^{2}=625\\\\4)\sqrt{x}=-4\\\\kornei.net$

$1)5\sqrt{2}-4\sqrt{8}+3\sqrt{32}=5\sqrt{2}-4\sqrt{4*2}+3\sqrt{16*2}=5\sqrt{2}-4*2\sqrt{2}+3*4\sqrt{2}=5\sqrt{2}-8\sqrt{2}+12\sqrt{2}=9\sqrt{2}$

$2)(\sqrt{75}-\sqrt{12})*\sqrt{3}=(\sqrt{25*3}-\sqrt{4*3})*\sqrt{3}=(5\sqrt{3}-2\sqrt{3})*\sqrt{3}=3\sqrt{3}*\sqrt{3}=3*(\sqrt{3})^{2}=3*3=9$

$3)(\sqrt{7}-3)^{2}=(\sqrt{7})^{2}-2*\sqrt{7}*3+3^{2}=7-6\sqrt{7}+9=16-6\sqrt{7}\\\\4)(\sqrt{5}+2\sqrt{2})(\sqrt{5}-2\sqrt{2}})= (\sqrt{5})^{2}-(2\sqrt{2})^{2} =5-8=-3$