Mathematics, 29.06.2019 17:00 kitttimothy55

Which equation represents an empty set? x2+4x+4=−y2 −15=−x2−y2−4x 1+x2−2x=−y2+8y−22 −21+x2+y2+4x=0

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Which equation represents an empty set? x2+4x+4=−y2 −15=−x2−y2−4x 1+x2−2x=−y2+8y−22 −21+x2+y2+4x=0...