Leyla /ley-la/ [2 sylls.] as a name for girls. Leyla's name origin is Arabic, and the meaning of Leyla is night beauty.
FYI: Different textbooks have different interpretations of the reference standard form of a quadratic function. Some say f (x) = ax2 + bx + c is standard form, while others say that f (x) = a(x - h)2 + k is standard form.
The derivative of a cubic function is a quadratic function. A critical point is a point where the tangent is parallel to the x-axis, it is to say, that the slope of the tangent line at that point is zero. In the following example we can see a cubic function with two critical points. One is a local maximum and the other is a local minimum. In these points, the derivative function (a parabola) cut the x-axis: