Ответы
Ответ дал:
0
x^2 - 5 = 2x^2 - x + 10x - 5
x^2 - 2x^2 - 9x = 0
- x^2 - 9x = 0
x^2 + 9x = 0
x (x + 9) = 0
1) x = 0;
2) x + 9 = 0 ==> x = - 9
Ответ
- 9; 0
Ответ дал:
0
x² - 5 = (x + 5) * (2x - 1)
x² - 5 = 2x² - x + 10x - 5
x² = 2x² - x + 10x
x² = 2x² + 9x
x² - 2x² - 9x = 0
-x ² - 9x = 0
![x = frac{ - ( - 9)± sqrt{( - 9) {}^{2} - 4} *( - 1) *0}{2 *( - 1)} \ \ x = frac{9 ±<br />sqrt{( - 9) {}^{2} } - 0 }{ - 2} \ \ x = frac{9 ±<br />sqrt{( - 9) {}^{2} } }{ - 2} \ \ x = frac{9 ±<br />9}{ - 2} \ \ x = - frac{9 ±<br />9}{2} \ \ \ x = - frac{9 + 9}{2} \ \ x = - frac{9 - 9}{2} \ \ x = - 9 \ x = 0 x = frac{ - ( - 9)± sqrt{( - 9) {}^{2} - 4} *( - 1) *0}{2 *( - 1)} \ \ x = frac{9 ±<br />sqrt{( - 9) {}^{2} } - 0 }{ - 2} \ \ x = frac{9 ±<br />sqrt{( - 9) {}^{2} } }{ - 2} \ \ x = frac{9 ±<br />9}{ - 2} \ \ x = - frac{9 ±<br />9}{2} \ \ \ x = - frac{9 + 9}{2} \ \ x = - frac{9 - 9}{2} \ \ x = - 9 \ x = 0](https://tex.z-dn.net/?f=x+%3D+frac%7B+-+%28+-+9%29%C2%B1+sqrt%7B%28+-+9%29+%7B%7D%5E%7B2%7D+-+4%7D+%2A%28+-+1%29+%2A0%7D%7B2+%2A%28+-+1%29%7D+%5C+%5C+x+%3D+frac%7B9+%C2%B1%26lt%3Bbr+%2F%26gt%3Bsqrt%7B%28+-+9%29+%7B%7D%5E%7B2%7D+%7D+-+0+%7D%7B+-+2%7D+%5C+%5C+x+%3D+frac%7B9+%C2%B1%26lt%3Bbr+%2F%26gt%3Bsqrt%7B%28+-+9%29+%7B%7D%5E%7B2%7D+%7D+%7D%7B+-+2%7D+%5C+%5C+x+%3D+frac%7B9+%C2%B1%26lt%3Bbr+%2F%26gt%3B9%7D%7B+-+2%7D+%5C+%5C+x+%3D+-+frac%7B9+%C2%B1%26lt%3Bbr+%2F%26gt%3B9%7D%7B2%7D+%5C+%5C+%5C+x+%3D+-+frac%7B9+%2B+9%7D%7B2%7D+%5C+%5C+x+%3D+-+frac%7B9+-+9%7D%7B2%7D+%5C+%5C+x+%3D+-+9+%5C+x+%3D+0)
ответ: x₁ = -9 x₂ = 0
x² - 5 = 2x² - x + 10x - 5
x² = 2x² - x + 10x
x² = 2x² + 9x
x² - 2x² - 9x = 0
-x ² - 9x = 0
ответ: x₁ = -9 x₂ = 0
Вас заинтересует
1 год назад
1 год назад
2 года назад
7 лет назад
7 лет назад
8 лет назад