Q.

The condition for the  polynomial equation ax2+bx+c=0  to be a quadratic is

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a

a>0

b

a<0

c

a≠0

d

a≠0,  b≠0

answer is C.

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Detailed Solution

The given equation ax2+bx+c=0  is a quadratic equation only if a≠0,   for if a=0  then the equation becomes bx+c=0,  which is not a second degree equation.So a  must be not equal to zero.
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