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Theorem: Let f(x)=ax^(2)+bx+c be a quadr...

Theorem: Let `f(x)=ax^(2)+bx+c` be a quadratic function.
If `a gt0` then f(x) has minimum value at `x=(-b)/(2a)` and the minimum value `=(4ac-b^(2))/(4a)`.

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The correct Answer is:
`=(4ac-b^(2))/(4a)`
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