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Minimum Value of a Quadratic Expression
## Formula
For:
$$ax^2+bx+c$$
when:
$$a>0$$
the minimum value is:
$$\frac{4ac-b^2}{4a}$$
or:
$$-\frac{D}{4a}$$
It occurs at:
$$x=-\frac{b}{2a}$$
## Usage
- Used to find the least possible value of a quadratic expression.
