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Unformatted text preview: out. Those final values when plugged back into the expression will make the denominator 0, thus making the rational expression undefined. So we have to watch out for any values when plugged into the rational expression will make the denominator zero. In this expression:-3xx2 16 This is a rational expression since it has a polynomial on the top and the bottom There might be values that the bottom polynomial can take which make the expression undefined. To figure them out, let’s set the denominator to zero. -= x2 16 0 Method 1:-= x2 16 0 = x2 16 = ± x 4 Method 2:-= x2 16 0 +- = x 4x 4 0 =- , x 4 4 =± x 4 So the expression can’t take the values of 4 or -4 or it will make the expression undefined....
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