2x²+9x+4 = 2x²+8x+x+4 = x(2x+1)+4(2x+1) = (2x+1)(x+4)
1. 2x+1 = 0
2x = -1
x = -0.5
2. x+4 = 0
x = -4
Ответ: -4 и -0.5
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2x²+9x+4 = 2x²+8x+x+4 = x(2x+1)+4(2x+1) = (2x+1)(x+4)
1. 2x+1 = 0
2x = -1
x = -0.5
2. x+4 = 0
x = -4
Ответ: -4 и -0.5