Normally a domestic freezer is best set to â18 Â°C (0 Â°F) or colder, as that's what the expiration dates for many food items are based on. It's also a requirement for freezers in restaurants, supermarkets & other places that sell food (at least here in Europe) to maintain a temperature of at most -18 Â°C.
Note: When you're dealing with quadratic equations, it can be really helpful to identify a, b, and c. These values are used to find the axis of symmetry, the discriminant, and even the roots using the quadratic formula. It's no question that it's important to know how to identify these values in a quadratic equation.
Summary. 1  Quadratic Equation in Standard Form: ax 2 + bx + c = 0. 2  Quadratic Equations can be factored. 3  Quadratic Formula: x = [ -b Â± â(b2-4ac) ] / 2a. 4  When the Discriminant (b2-4ac) is: 5  positive, there are 2 real solutions. 6  zero, there is one real solution. 7  negative, there are 2 complex solutions.