Đại số 8

N

nguyenbahiep1

[laTEX] B=(x-1).(x+2).(x+3).(x+6) \\ (x-1)(x+6)(x+2)(x+3) = (x^2+5x-6)(x^2+5x+6) \\ (x^2+5x)^2 - 6^2 \geq - 6^2 = - 36 \\ Min B = -36 \\ x^2 + 5x = 0 \Rightarrow x = 0 \\ x = - 5 [/laTEX]
 
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