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Question

If the graph of quadratic polynomial ax2+bx+c is


then which of the following is/are correct?

A
b<0
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B
c>0
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C
a>0
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D
D<0
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Solution

The correct option is D D<0


The graph is an upward parabola so a>0
As it doesn't touch x axis so D<0
The x coordinate of vertex is
b2a>0b<0
And f(0)>0c>0

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