Posted by pj on Wednesday, December 17, 2008 at 9:24pm.
factor each of your denominators.
the LCD should contain all the factors that are in any denominator..
for (1)
since your first denominator does not factor, your LCD is (3v^2-3v-7)(3v-3)
are you sure you typed it correctly, I would have expected the first part to factor
for (2)
14z^7 = 14z^7
98z^8 = (14z^7)(7z)
so 98z^8 is the LCD
for (3)
y^3+6y^2+9y = y(y+3)^2
y^2-6y = y(y-6)
so LCD = y(y-6)(y+3^2
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