F.4 MATHS(quadratic functions)
2011-08-17 2:56 am
Consider the equation x^2 +(3+m)x+3m-1=0,where m is a constant.when the discriminant of the equation is at the minimum ,find the value of m.
回答 (1)
2011-08-17 3:26 am
✔ 最佳答案
Consider the equation x^2 +(3+m)x+3m－1=0，where m is aconstant.when the discriminant of the equation is at the minimum，find the value of m.
Sol
D=(3+m)^2－4*1*(3m－1)
=(m^2+6m+9)－(12m－4)
=m^2－6m+13
=(m－3)^2+4
m－3=0
m=3
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