Question

Помогите пожалуйста решить 2 номера
Даю много балов

Answer 1

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

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

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

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