Question

北極熊

求解 高職數B

-66
(C
30%
已知x*−13x²+36=(x-a)(x-b)(x-c)(x-d),且a<b<c<d,則b+d 之値為何?
(A)-1(B)0-(C) 1 (D)2+x 6-发日者。嬝實一點【107 統測 S
(CI)
TC) (D) 3
IS-

(9-x) (9+x)
(St=x)(n+x)
SEXT
{q+(91₂*)<>

Answer 1

綾

x^4 - 13x^2 + 36
= (x^2 - 4)(x^2 - 9)
= (x - 2)(x + 2)(x - 3)(x + 3)

a = -3
b = -2
c = 2
d = 3
b + d = 1