When b 2 4 a c 0 there are two real roots. Quadratic equations are also needed when studying lenses and curved mirrors. The Quadratic Formula uses the a b and c from ax 2 bx c where a b and c are just numbers.
2 x2 - 2x 5.
We know that a quadratic equation will be in the form. The name comes from quad meaning square as the variable is squared in other words x2. Taking square root of both the sides. A quadratic equation is an equation that could be written as ax 2 bx c 0 when a 0.