F.4 Mathematics Quadratic equations 求救

kiddo928

( p² + 4 )x² + 4 - 10x = 0

Prove that for all value of p, the equation has no real roots

完全無頭緒... 求救 ..

kiddo928

回復 2# 小雪冰


   discriminant 呢d我都明==不過2個unknown我真係r曬頭..

delta = 10² - 4 ( p² + 4 ) ( 4 )
        = 100 - 16p² - 64
        = - 16p² + 36

跟住可以點 .. 真係無從入手..
---------------------------------

其實好似有d怪.. 因為如果p=1

就變左 -16 + 36

delta > 0

錦米有real roots ..

kiddo928

回復 4# 小雪冰


   我諗應該系出錯.. 同學問我的.. check過都無抄錯
anyway thanks

kiddo928

回復 6# iversonman


   納尼...計到架?!
請指教.....