Question

已知：如图,抛物线))(2(bxxay的图像与x轴交于A、B两点,A在B

Answer 1

(1)

y = a(x + 2)(x - b)

A(-2,0),B(b,0),AO = 2

tan∠CAB = OC/OA = OC/2 = 2,OC = 4

C(0,4)

x = 0,y = -2ab = 4,ab = -2

显然缺少条件.