Amathz

1. 點樣prove條quadractic equation有幾多個roots呀?
用discriminant
對
ax^2+bx+c=0
discriminant=b^2-4ac
若
discriminant>0 有兩個相異根
discriminant=0 有兩個相等實根
discriminant<0 冇實數解
2. a^4+a^4=2a^4
3. a^4-a^4=0
4.amathz應該點讀先會高分架?
做多些練習