quadratic

(noun)

Of degree two; can apply to polynomials.

Related Terms

  • scaling
  • constant
  • factor
  • dependent variable
  • independent variable
  • quadratic function
  • discriminant
  • degree
  • zero
  • vertex
  • parabola

(noun)

A polynomial of degree two.

Related Terms

  • scaling
  • constant
  • factor
  • dependent variable
  • independent variable
  • quadratic function
  • discriminant
  • degree
  • zero
  • vertex
  • parabola

Examples of quadratic in the following topics:

  • Solving a Quadratic Equation with the Quadratic Formula

  • What is a Quadratic Function?

    • Quadratic equations are second order polynomials, and have the form f(x)=ax2+bx+cf(x)=ax^2+bx+cf(x)=ax​2​​+bx+c.
    • A quadratic function is of the general form:
    • A quadratic equation is a specific case of a quadratic function, with the function set equal to zero:
    • All quadratic functions both increase and decrease.
    • Quadratic functions can be expressed in many different forms.
  • The Quadratic Formula

    • The zeros of a quadratic equation can be found by solving the quadratic formula.
    • The quadratic formula is one tool that can be used to find the roots of a quadratic equation.  
    • The quadratic formula can always be used to find the roots of a quadratic equation, regardless of whether the roots are real or complex, whole numbers or fractions, and so on.
    • The first criterion must be satisfied to use the quadratic formula because conceptually, the formula gives the values of xxx where the quadratic function f(x)=ax2+bx+c=0f(x) = ax^2+bx+c = 0f(x)=ax​2​​+bx+c=0; the roots of the quadratic function.
    • Solve for the roots of a quadratic function by using the quadratic formula
  • Completing the Square

    • Completing the square is a method for solving quadratic equations, and involves putting the quadratic in the form 0=a(x−h)2+k0=a(x-h)^2 + k0=a(x−h)​2​​+k.
    • Along with factoring and using the quadratic formula, completing the square is a common method for solving quadratic equations.  
    • This quadratic is not a perfect square.  
    • However, it is possible to write the original quadratic as the sum of this square and a constant:
    • Solve for the zeros of a quadratic function by completing the square
  • A Graphical Interpretation of Quadratic Solutions

    • The roots of a quadratic function can be found algebraically or graphically.
    • Recall how the roots of quadratic functions can be found algebraically, using the quadratic formula (x=−b±b2−4ac2a)(x=\frac{-b \pm \sqrt {b^2-4ac}}{2a})(x=​2a​​−b±√​b​2​​−4ac​​​​​).
    • Consider the quadratic function that is graphed below.
    • Recall that the quadratic equation sets the quadratic expression equal to zero instead of f(x)f(x)f(x):
    • Graph of the quadratic function f(x)=x2−x−2f(x) = x^2 - x - 2f(x)=x​2​​−x−2
  • Standard Form and Completing the Square

    • In algebra, parabolas are frequently encountered as graphs of quadratic functions, such as:
    • Completing the square may be used to solve any quadratic equation.
    • This can be applied to any quadratic equation.
    • Graph with the quadratic equation .
    • The graph of this quadratic equation is a parabola with x-intercepts at -1 and -5.
  • Other Equations in Quadratic Form

    • Many equations with no odd-degree terms can be reduced to quadratics and solved with the same methods as quadratics.
    • If a substitution can be made such that the higher order polynomial takes the form of a quadratic, any method for solving a quadratic equation can be applied.  
    • Consider a quadratic function with no odd-degree terms which has the form:
    • With substitution, we were able to reduce a higher order polynomial into a quadratic equation.  
    • Use the quadratic formula to solve any equation in quadratic form
  • The Discriminant

    • where aaa, bbb and cccare the constants (aaa must be non-zero) from a quadratic polynomial.
    • The discriminant Δ=b2−4ac\Delta =b^2-4acΔ=b​2​​−4ac is the portion of the quadratic formula under the square root.
    • If Δ{\Delta}Δ is equal to zero, the square root in the quadratic formula is zero:
    • Since adding zero and subtracting zero in the quadratic equation lead to the same outcome, there is only one distinct root of the quadratic function.
    • Graph of a polynomial with the quadratic function f(x)=x2−x−2 f(x) = x^2 - x - 2f(x)=x​2​​−x−2.
  • Linear and Quadratic Equations

    • Two kinds of equations are linear and quadratic.
    • A quadratic equation is a univariate polynomial equation of the second degree.
    • A general quadratic equation can be written in the form:
    • The term "quadratic" comes from quadratus, which is Latin for "square. " Quadratic equations can be solved by factoring, completing the square, graphing, Newton's method, and using the quadratic formula.
    • Examples of graphed quadratic equations can be seen below.
  • Graphing Quadratic Equations In Standard Form

    • A quadratic function is a polynomial function of the form y=ax2+bx+cy=ax^2+bx+cy=ax​2​​+bx+c.
    • Regardless of the format, the graph of a quadratic function is a parabola.
    • Each coefficient in a quadratic function in standard form has an impact on the shape and placement of the function's graph.
    • The coefficient aaa controls the speed of increase (or decrease) of the quadratic function from the vertex.
    • Explain the meanings of the constants aaa, bbb, and ccc for a quadratic equation in standard form
Subjects
  • Accounting
  • Algebra
  • Art History
  • Biology
  • Business
  • Calculus
  • Chemistry
  • Communications
  • Economics
  • Finance
  • Management
  • Marketing
  • Microbiology
  • Physics
  • Physiology
  • Political Science
  • Psychology
  • Sociology
  • Statistics
  • U.S. History
  • World History
  • Writing

Except where noted, content and user contributions on this site are licensed under CC BY-SA 4.0 with attribution required.