Question

Помогите пожалуйста решить умоляю
даю 40 баллов​

Answer 1

Ответ:

1. а)

$3 {x}^{2} + 13x - 10 = 0 \\ x = - \frac{10}{3} \\ x = - 1$

б)

$2 {x}^{2} - 3x = 0 \\ x(2x - 3) = 0 \\ x = 0 \\ 2x - 3 = 0 \\ 2x = 3 \\ x = \frac{3}{2}$

в)

$16 {x}^{2} = 49 \\ {x}^{2} = \frac{49}{16} \\ x = \frac{7}{4}$

2.

$s = a \times b \\ p = 2a + 2b \\ 2a + 2b = 30 \\ ab = 56 \\ b = - a + 15 \\ a( - a + 15) = 56 \\ - {a}^{2} + 15a - 56 = 0 \\ b \\ {15}^{2} - 4 \times ( - 1) \times ( - 56) = 225 - 224 = 1 \\ a = 7 \\ b = 8$

3.

${x}^{2} + 11x + q = 0 \\ q = 28 \\ x1 = - 7 \\ x2 = - 4$