4) 3х^2 +12=0; 5) 5х^2 – 30=0; 6) х^2 – 5х + 6=0; 7) 2х^2 +7х–9=0; 8) 5х^2 +8х–4=0; 9) у^2

Ответы 1

$4)3 {x}^{2} = - 12 \\ {x}^{2} = - 4$ Нет решения $5)5 {x}^{2} = 30 \\ {x}^{2} = 6 \\ x1 = \sqrt{6} \\ x2 = - \sqrt{6}$ $6) {x}^{2} - 5x + 6 = 0 \\ d = 25 - 24 = 1 \\ x1 = \frac{5 + 1}{2} = 3$ $x2 = \frac{5 - 1}{2} = 2$ $7)2 {x}^{2} + 7x - 9 = 0 \\ d = 49 + 72 = 121 = 11$ $x1 = \frac{ - 7 - 11}{4} = - \frac{18}{4} = - 4.5 \\ x2 = \frac{ - 7 + 11}{4} = \frac{4}{4} = 1$ $8)5 {x}^{2} + 8x - 4 = 0 \\ d = 64 + 80 = 144 = 12$ $x1 = \frac{ - 8 - 12}{10} = - \frac{20}{10} = - 2$ $x2 = \frac{ - 8 + 12}{10} = \frac{4}{10} = 0.4$ $9) {y}^{2} + 8y + 16 = 0 \\ d = 64 - 64 = 0 \\ x = \frac{ - 8 + 0}{2} = - 4$ $10) - {t}^{2} - 3t + 1 = 0 \times ( - 1) \\ {t}^{2} + 3t - 1 = 0 \\ d = 9 + 4 = 13 = \sqrt{13}$ $x1 = \frac{ - 3 - \sqrt{13} }{2} \\ x2 = \frac{ - 3 + \sqrt{13} }{2}$ $11)3 {a}^{2} + a + 4 = 0 \\ d = 1 - 48 = - 47$ Нет решения
- Автор:
  bbmymi
- 5 лет назад
- 0
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