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Before deciding whether an equation is quadratic, you often need to:
ASquare it
BDouble it
CGraph it
DSimplify it
Answer & Solution
Correct answer: D. Simplify it
1. Brackets can hide the true degree.
2. Expanding and collecting terms shows it.
3. So simplify first.
_Source: NCERT Class 10 Mathematics, Chapter 4, Quadratic Equations._
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