Question

√ x^2-4=9


√x-17=5


√8x-4= √3x+4

Буду благодарна

Answer 1

Ответ:

1)

$\sqrt{ {x}^{2} - 4 } = 9 \\ {x}^{2} - 4 = 81 \\ {x}^{2} = 85 \\ x_{1}= - \sqrt{85} \\ x_{2} = \sqrt{85}$

2)

$\sqrt{x - 17} = 5 \\ x - 17 = 25 \\ x = 42$

3)

$\sqrt{8x - 4} = \sqrt{3x + 4} \\ 8x - 4 = 3x + 4 \\ 8x - 3x = 4 + 4 \\ 5x = 8 \\ x = \frac{8}{5} \\ x = 1.6$