Ответ:
3x+18 = x²+9x+2x+18
-x²-9x-2x+3x = 0
-x²-8x = 0 | ·(-1)
x²+8x = 0
x(x+8) = 0
x = 0 или x+8 = 0
x = -8
Ответ: 0 и 8.
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3x=x+2x
3x=3x
Ответ:
3x+18 = x²+9x+2x+18
-x²-9x-2x+3x = 0
-x²-8x = 0 | ·(-1)
x²+8x = 0
x(x+8) = 0
x = 0 или x+8 = 0
x = -8
Ответ: 0 и 8.