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In that standard form, the one restriction placed on the coefficient a is that it is:
ANot zero
BNot one
CNot even
DNot prime
Answer & Solution
Correct answer: A. Not zero
1. A zero value would remove the squared term.
2. The equation would stop being quadratic.
3. The restriction is that a is not zero.
_Source: NCERT Class 10 Mathematics, Chapter 4, Quadratic Equations._
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