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2 * ( x + 3)
y= 2
x + 6x + 9
2
Consider this
equation
2 * ( x + 3)
y= 2
x + 6x + 9
2
This looks like a
fairly complicated
function of x
2 * ( x + 3)
2 * ( x + 6 x + 9)
y= 2
=
=2
2
x + 6x + 9
( x + 6 x + 9)
2
2
If you expand it, it simplifies dramatically
$
2 * ( x + 3)
y= 2
x + 6x + 9
2
Let x equal -3
2 * (−3 + 3) 2
0
y=
= 2 * = undefined
9 − 18 + 9
0
When x is equal to -3, the equation is undefined
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