Question

Помогите с 8,9 и 10!!!

Answer 1

#8

$(x - (2 - \sqrt{2} ) )(x - (2 + \sqrt{2} ) = 0$

$(x - 2 + \sqrt{2} )(x - 2 - \sqrt{2} ) = 0$

$(x - 2) {}^{2} - ( \sqrt{2} ) {}^{2} = 0$

(х-2)²-2=0

х²-4х+2=0

Ответ: В)

#9

х²-4х+1=0

D=16-4=12

x1=4+2√3/2=2+√3

x2=4-2√3/2=2-√3

$\sqrt{x1} + \sqrt{x2} = \sqrt{(2 + \sqrt{3}) } + \sqrt{(2 - \sqrt{3} )} = \sqrt{6}$

Ответ: D)