Question

СРОЧНО помогите ДАЮ 50 БАЛОВ ПОЖАЛУЙСТА ПОМОГИТЕ

Answer 1

$y = - \frac{1}{7} {x}^{2} - 25$

$x = 0\\ y = - \frac{1}{7 } \times {0}^{2} - 25 = - 25$

$x = - 7 \\ y = - \frac{1}{7 } \times {( - 7)}^{2} - 25 = - \frac{1}{7} \times 49 - 25 = \\ = - 7 - 25 = - 32$

$x = 3\\ y = - \frac{1}{7 } \times {3}^{2} - 25 = - \frac{1}{7} \times 9 - 25 = - 1 \frac{2}{9} - 25 = - 26 \frac{2}{7}$

$x = 5\\ y = - \frac{1}{7 } \times {5}^{2} - 25 = - \frac{1}{7} \times 25 - 25 = \\ = - 3 \frac{4}{7} - 25 = - 28 \frac{4}{7}$

$x = 21\\ y = - \frac{1}{7 } \times {21}^{2} - 25 = - \frac{1}{7} \times 441 - 25 = \\ = - 63 - 25 = - 88$

$x =14 \\ y = - \frac{1}{7 } \times {14}^{2} - 25 = - \frac{1}{7} \times 196 - 25 = \\ = - 28 - 25 = - 53$

$x = - \frac{7}{5} \\ y = - \frac{1}{7 } \times {( - \frac{7}{5}) }^{2} - 25 = - \frac{1}{7} \times \frac{49}{25} - 25 = \\ = - \frac{7}{25} - 25 = - 0.28 - 25 = - 25.28$

$y = - 277 \\ - \frac{1}{7} {x}^{2} - 25 = - 277 \\ - \frac{1}{7} {x}^{2} = - 277 + 25 \\ - \frac{1}{7} {x}^{2} = - 252 \\ {x}^{2} = - 252 \times ( - 7) \\ {x}^{2} = 1764 \\ x_{1} = - 42 \\ x_{2} = 42$