The graph of the quadratic trinomial y=ax2+bx+c has its vertex at (4, -5) and two x-intercepts, one positive and one negative. Which of the following holds good?
a > 0
b < 0
c < 0
8a = b
From figure,
−b2a=4 or −b2a>0
∴ b<0 f(0)=c<0
Also, −b2a=4 or 8a+b=0