解不等式問題 ~~ thx~

👨🏻‍🏫 學術台數學

2008-10-07 8:05 pm

Find the value of k if the equation x^2 - kx + 9 = 0 has two distinct real roots

回答 (2)

2008-10-07 8:33 pm

✔ 最佳答案

Δ>0
(- k) 2 -4(1)(9)>0
k2-36>0
k2>36
k<-6 or k>6//

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2008-10-07 8:22 pm

△=0
(-k)^2-4(1)(9)=0
k^2=36
k=±6

參考: me~

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