Question

北極熊

求解 高職數B

(B)23 若k為實數,且滿足方程式x²-6x+k=0有兩實根a、b,則a+b=? (A) 10
(B) 6 (C)-2 (D)-6°
【106統測
C) 2

23
9.
B = k

Answer 1

綾

x^2 - 6x + k
= (x - a)(x - b)
= x^2 - (a+b)x + ab

a + b = 6