View Full Version : finding x-intercept(s) of y = (x^3 + 3x^2)/(2(x^2 + x - 6))
I am a little rusty on this topic....How do you find x-intercept(s) of the equation
07-18-2006, 12:15 PM
Find the x-intercept(s) in the usual manner: Plug zero in for "y", and solve the resulting equation.
In this case, of course, it is helpful to remember that a fraction is zero when its numerator is zero. :wink:
07-18-2006, 12:21 PM
y = (x^3 + 3x^2)/ [2*(x^2 + x - 6)]
y = x^2(x + 3)/[2(x + 3)(x - 2)]
the (x+3) in the numerator and denominator cancel, creating a removable discontinuity (a hole) at x = -3. the numerator equals zero at x = 0, so a single x-intercept is at the origin, (0,0).
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