Apply those critical numbers in the second derivative. To find these important values given a quadratic function we use the vertex. Fx y y.
Let fx be a real-valued function.
SANGEERTH P on 15 Jan 2020 Accepted Answer. The horizontal line test can determine if a function is one-to-one. If you want to substitute a value in a function you could accomplish this task by using paper and a pencil. If the leading coefficient a is negative then the parabola opens downward and there will be a maximum y -value.