Pure Math 一問
1)Prove that if b^2<4c, then x^2+bx+c>0 for all real number x. 1)Prove that if b^20 for all real number x.檸樂 發表於 25-5-2012 20:57 http://www.nakuz.com/bbs/images/common/back.gif
判別式黎架....
b^2-4c <0
即delta<0
所以y=x^2+bx+c呢條識係no real solution
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