(x+2)(x-5)-3x(1-2x)
x^{2} +2x-5x-10-3x+6x
x^{2} -10
x= (корень)10
Б)
(x+2)(x-5)-3x(1-2x)<span />
x= -1 подставляем
(-1+2)(-1-5)+3(1+2)=1*-6+3*3=-6+9=3
Ответ:3
![y = x*\frac{46}{5} - (x-5)*\frac{6}{5}\\\\ y(0) = 0 - (-5)*\frac{6}{5} = 6\\\\ y(5) = 5*\frac{46}{5} - 0 = 46](https://tex.z-dn.net/?f=y+%3D+x%2A%5Cfrac%7B46%7D%7B5%7D+-+%28x-5%29%2A%5Cfrac%7B6%7D%7B5%7D%5C%5C%5C%5C+y%280%29+%3D+0+-+%28-5%29%2A%5Cfrac%7B6%7D%7B5%7D+%3D+6%5C%5C%5C%5C+y%285%29+%3D+5%2A%5Cfrac%7B46%7D%7B5%7D+-+0+%3D+46)
Уравнение можно преобразовать к такому виду:
![y = x*\frac{46}{5} - (x-5)*\frac{6}{5} | * 5\\\\ 5y = 46x - 6(x-5)\\\\ 5y = 40x +30 | : 5\\\\y = 8x + 6](https://tex.z-dn.net/?f=+y+%3D+x%2A%5Cfrac%7B46%7D%7B5%7D+-+%28x-5%29%2A%5Cfrac%7B6%7D%7B5%7D+%7C+%2A+5%5C%5C%5C%5C+5y+%3D+46x+-+6%28x-5%29%5C%5C%5C%5C+5y+%3D+40x+%2B30+%7C+%3A+5%5C%5C%5C%5Cy+%3D+8x+%2B+6)
Первоначальное уравнение было найденно таким способом:
![y = (x - x_1)\frac{y_2}{x_2-x_1} + (x - x_2)\frac{y_1}{x_1-x_2}](https://tex.z-dn.net/?f=y+%3D+%28x+-+x_1%29%5Cfrac%7By_2%7D%7Bx_2-x_1%7D+%2B+%28x+-+x_2%29%5Cfrac%7By_1%7D%7Bx_1-x_2%7D)
<span> (2p-3)(2p+3)+(p-2)^2</span>
4р^2-9+p^2-4p+4
5p^2-4p-5
Фото::::::::::::::::::::::::::::::::
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