Most chordates are vertebrates. Invertebrate chordates, which belong to two of the subphyla of chordatesâCephalochordata and Urochordata, also have a dorsal tubular nerve cord, a notochord, pharyngeal pouches, a postanal tail, and, possibly, an ancestral thyroid gland.They ha ve no backbone, however.ost chordates are vertebrates. Invertebrate chordates, which belong to two of the subphyla of chordatesâCephalochordata and Urochordata, also have a dorsal tubular nerve cord, a notochord, pharyngeal pouches, a postanal tail, and, possibly, an ancestral thyroid gland. They ha ve no backbone, however.
Quadratic Equation. An equation where the highest exponent of the variable (usually x) is a square (2). It is usually written ax2+bx+c = 0 Example: 2x2+5x-3 = 0. See: Exponent. Quadratic Equations.
The Simplest Quadratic. The simplest Quadratic Equation is: f(x) = x 2. And its graph is simple too: This is the curve f(x) = x2. It is a parabola. Now let us see what happens when we introduce the a value: f(x) = ax2. 1  Larger values of a squash the curve inwards.2  Smaller values of a expand it outwards. 3  And negative values of a flip it upside down.he simplest Quadratic Equation is: f(x) = x 2. And its graph is simple too: This is the curve f(x) = x2. It is a parabola. Now let us see what happens when we introduce the a value: f(x) = ax2. 1  Larger values of a squash the curve inwards.