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?
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a
a > 0
b
b < 0
c
c < 0
d
8a = b
answer is A.
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Detailed Solution
From figure,a > 0−b2a=4 or −b2a>0∴ b<0 f(0)=c<0Also, −b2a=4 or 8a+b=0