Question

已知函数y=ax^2+bx+c(a≠0)和y=mx+n的图像交于(-2,-5)点和(1,4)点并且y=ax^2+bx+c

Answer 1

y=ax^2+bx+c(a≠0)和y=mx+n的图像交于(-2,-5)点和(1,4)

-5=-2m+n,4=m+n,m=3,n=1

-5=4a-2b+c

4=a+b+c

c=3 a=-1 ,b=2

y1=-x^2+2x+3,y2=3x+1