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Find x-intercept and y-intercept for the function: f(x)=9x^2+12x+4.
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Find x-intercept and y-intercept for the function: f(x)=9x^2+12x+4.
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malylo
First timers
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Find x-intercept and y-intercept for the function: f(x)=9x^2+12x+4.
«
on:
10/11/2011 03:01:47 »
Look at the function: f(x)=9x^2+12x+4. Please find x-intercept and y-intercept.
Please stop posting links to commercial sites or you will be banned - mod
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Last Edit: 10/11/2011 03:22:34 by JP
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CliffordK
Neilep Level Member
6321
Site Moderator
Find x-intercept and y-intercept for the function: f(x)=9x^2+12x+4.
«
Reply #1 on:
10/11/2011 04:31:16 »
y=9x
^{2}
+12x+4
The Y-intercept is easy to calculate. Just set X=0.
y=9*0
^{2}
+12*0+4 =
4
To calculate the X-intercept, it is easiest to first factor the quadratic, in this case it is relatively easy, a perfect square.
y=(3x+2)(3x+2)
Now, set Y=0.
0=(3x+2)(3x+2)
So, either half (which is the same) must equal zero.
0=3x+2
3x=-2
x=-2/3
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