Question

Пожалуйста помогите!!!очень срочно! ⚠️

Answer 1

1)0,25x² - x + 1 = 0

x² - 4x + 4 = 0

D = (- 4)² - 4 * 4 = 16 - 16 = 0

$x=\frac{4}{2}=2$

Ответ : 2

2) 7x² + 18x + 5 = 0

D = 18² - 4 * 7 * 5 = 324 - 140 = 184

$x_{1}= \frac{-18+\sqrt{184}} {14}= \frac{-18+2\sqrt{46}} {14}= \frac{-9+\sqrt{46}} {7}\\\\x_{2}= \frac{-18-2\sqrt{46}} {14} =\frac{-9-\sqrt{46}} {7}$

3) - 3x² + 11x + 4 = 0

3x² - 11x - 4 = 0

D = (- 11)² - 4 * 3 * (- 4) = 121 + 48 = 169 = 13²

$x_{1} =\frac{11+13}{6}=4\\\\x_{2} =\frac{11-13}{4}=-0,5$

Ответ : - 0,5 ; 4

4) 9x² - 4x - 2 = 0

D = (- 4)² - 4 * 9 * (- 2) = 16 + 72 = 88

$x_{1} =\frac{4+\sqrt{88}} {18}= \frac{4+2\sqrt{22}} {18}= \frac{2+\sqrt{22}} {9}\\\\x_{2}= \frac{4-2\sqrt{22}} {18}= \frac{2-\sqrt{22}} {9}$