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The graph of the quadratic trinomial u=a...

The graph of the quadratic trinomial `u=a x^2+b x+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. `b<0` c. `<0` d. `8a=b`

A

`agt0`

B

`blt0`

C

`clt0`

D

`8a=b`

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