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Compare the values of 3x2 + 4 and 2x2 + 4x by collocation method
（3x2+4）-（2x2+4x）=x2-4x+4=（x-2）2，∵（x-2）2≥0，∴3x2+4≥2x2+4x．
Please answer the math questions as soon as possible!
A passenger train and a freight train leave from two stations 396km apart. The passenger train leaves one hour after the freight train leaves. It is known that the passenger train travels 68km per hour and the freight train 48km per hour. When will the two vehicles meet?
(396-48) / (48 + 68) = 3 hours
Ask about inequality
The solution set of ax ^ 2 + BX + C > 0 is (- 1,3). Find the solution set of Cx ^ 2 + BX + a > 0
The solution set of ax ^ 2 + BX + C > 0 is - 10
(x-1/3)(x+1)>0
x1/3
Ask the question of inequality
The solution of inequality about X
X ^ 2 + ax + 4 > 0 (a belongs to R)
1) When △ = a ^ 2-4 * 4 > = 0, that is a > = 4 or a
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