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The standard form of a quadratic equation is
A$ax+b=0$
B$ax^3+bx^2+cx+d=0$
C$ax^2+bx+c=0,\ a\ne 0$
D$ax^2+bx+c=0,\ a=0$
Answer & Solution
Correct answer: C. $ax^2+bx+c=0,\ a\ne 0$
1. A quadratic equation has degree 2.
2. Its standard form is $ax^2+bx+c=0$ with $a\ne 0$.
3. If $a=0$ it would be linear, not quadratic.
_Source: Karnataka SSLC (KSEEB) Class 10 Mathematics, Ch10 'Quadratic Equations', §10.1_
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