Find k if 2x +(3k 1)x 8 has equal roots?

👨🏻‍🏫 學術台數學

[匿名]

2015-09-06 5:23 pm

回答 (1)

用戶45850

2015-09-07 3:55 am

題目不全
若是2x^2+(3k+1)x+8=0
D=b^2-4ac=(3k+1)^2-4*2*8=0
==>(3k-7)(k+3)=0
==>k=7/3或k=-3

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