AM-1234

Quadratic models

A Math · Secondary 4 · Medium · Quadratic models

1. No, because substituting $x=7$ gives $y=1.5$, not 10.
2. Yes, because substituting $x=7$ gives $y=10$.
3. Yes, because $7$ lies between the roots 4 and 16.
4. No, because the arch only exists for $x<4$ or $x>16$.

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