Exercise 4 (Proving a fact about Cartesian products). Let X CR² be a cartesian product of two subsets of R, i.e. there erist C, DCR such that X = C x D. Prove (rigorously) that if {(-3, 1), (0, -2), (6, 2)} CX, then X contains at least nine points. Which ones?

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A: Explanation of the answer is as follows

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A: Symmetric matrix

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A: Use the property z1z2=z1z2 and z=x2+y2. Take z=a+ib. So,  z-4z+6+i=4z-4z+6+i=4

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