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Factorising splits the quadratic into two linear factors; the roots come from setting each factor to:
ATwo
BNine
CZero
DOne
Answer & Solution
Correct answer: C. Zero
1. A product is zero when one factor is zero.
2. Each linear factor gives one root.
3. So each factor is equated to zero.
_Source: NCERT Class 10 Mathematics, Chapter 4, Quadratic Equations._
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