4. [Disproof by Counter Example] Prove that the following statements are false. a) x²=4 => x=2. b) For all real values of a and b, a-b>0 a²-b² >0. c) The sum of two unequal, positive, irrational numbers is irrational. d) The product of two unequal, positive, irrational numbers is irrational.

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