7y² Consider the quadric surface r² + the usual coordinate axes, i.e. so that the principal axes are in the directions of (1,0,0), (0,1,0) and (0,0,1). Hint: the answers are integers. Thus 4z + axy +byz + cxz. Find values of a, band c in such a way that the principal axes will be we have type your answer. b = type your answer. type your answer. C=

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