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Quadratic equations

  1. Feb 19, 2012 #1
    A quadratic equation has the form y = ax^2 + bx + c. However, if c = 0, then y = ax^2 + bx. Is it still called a quadratic equation? And if b = 0 so that y = ax^2, is it still given the title of quadratic equation?

    I would guess yes since it still has a power of 2 and is a parabola. Is this correct?
     
  2. jcsd
  3. Feb 19, 2012 #2

    Mark44

    Staff: Mentor

    What you're showing is a quadratic function. A quadratic equation in standard form looks like this:
    ax2 + bx + c = 0
    ax2 + bx = 0 is still a quadratic equation. The only restriction is that a [itex]\neq[/itex] 0.
     
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