Condition for $(a^{2} - 9) x^{2} + b x + c = 0$ to be a quadratic equation is

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Solution

The correct option is D

For degree of $x^{2}$ to be not equal to zero, $a \neq 3$ and also $a \neq - 3$ . Also a, b, c are real for the given equation to be quadratic.

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