Question

ПОМОГИТЕ ПОЖАЛУЙСТА ДАЮ 100 БАЛОВ.​

Answer 1

$\displaystyle\bf\\1)\\\\x^{4}-3x^{2} -4=0\\\\x^{2} =m \ , \ m\geq 0\\\\m^{2} -3m-4=0\\\\D=(-3)^{2} -4\cdot(-4)=9+16=25=5^{2} \\\\\\m_{1}=\frac{3+5}{2}=\frac{8}{2} =4\\\\\\m_{2} =\frac{3-5}{2}=\frac{-2}{2} =-1 < 0 \ - \ ne \ podxodit\\\\\\x^{2} =4\\\\x_{1,2} =\pm \ \sqrt{4} =\pm \ 2\\\\Otvet \ : \ -2 \ ; \ 2$

$\displaystyle\bf\\2)\\\\\frac{x^{2} }{x+2} =\frac{4}{x+2} \\\\\\x+2\neq 0 \ \ \Rightarrow \ \ x\neq -2\\\\\\x^{2}=4\\\\x_{1} =\sqrt{4} =2\\\\x_{2} =-\sqrt{4} =-2 \ - \ ne \ podxodit\\\\Otvet \ : \ 2$