1) х+2=9
х=9-2
х=7
2) -х-2=9
-х=9+2
-х=11 |:(-1)
х=-11
-4а²-в, при а=-3,в=-2
-4·(-3)²-(-2)=-4·9+1=-35
X^3 - 3x^2 + 3x - 1 = ( x^3 - 1 ) - ( 3x^2 - 3x ) = ( x - 1 )( x^2 + x + 1 ) - 3x( x -
- 1 ) = ( x - 1 )( x^2 + x + 1 - 3x ) = ( x - 1 )( x^2 - 2x + 1 ) =
= ( x - 1 )( x - 2 )^2
![9^{x+3} +26*3^{x}-3=0\\\\9^{x}*9^{3}+26*3^{x}-3=0\\\\729*3^{2x}+26*3^{x} -3=0\\\\3^{x}=m,m>0\\\\729m^{2}+26m-3=0\\\\D=26^{2}-4*729*(-3)=676+8748=9424](https://tex.z-dn.net/?f=9%5E%7Bx%2B3%7D+%2B26%2A3%5E%7Bx%7D-3%3D0%5C%5C%5C%5C9%5E%7Bx%7D%2A9%5E%7B3%7D%2B26%2A3%5E%7Bx%7D-3%3D0%5C%5C%5C%5C729%2A3%5E%7B2x%7D%2B26%2A3%5E%7Bx%7D+-3%3D0%5C%5C%5C%5C3%5E%7Bx%7D%3Dm%2Cm%3E0%5C%5C%5C%5C729m%5E%7B2%7D%2B26m-3%3D0%5C%5C%5C%5CD%3D26%5E%7B2%7D-4%2A729%2A%28-3%29%3D676%2B8748%3D9424)
Корень не извлекается. Может уравнение записано с ошибкой?