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OpenStudy (anonymous):
r^3+6r ------ r^2-4 find all numbers for which the rational expression is undefined
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OpenStudy (blacksteel):
The expression will be undefined anywhere that you are trying to divide by 0. Thus, the equation will be undefined at solutions to r^2 - 4 = 0, or r = 2 and r = -2.
jhonyy9 (jhonyy9):
r^2 -4 =0 r_1=2 r_2=-2 - whne the denominator will be zero
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