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hi everyone this is question nine from tutorial sheet one yeah so please make sure that you click on the button which says subscribe yeah so that you donamp;#39;t miss out the videos that iamp;#39;m going to be posting so letamp;#39;s quickly start solving question nine i know most people want to know how to solve this question itamp;#39;s simple and straightforward yeah and then okay yeah letamp;#39;s proceed so the question is telling us to say the operation is calm sorry the operation star on the set of real numbers are is defined by a step b which is equal to a squared plus b squared minus 2 where a and b are members of our members of real numbers so the first question is telling us to say is star a binary operation on the set of real numbers here the the other way you can ask yourself a question if youamp;#39;ve been asked that question is that is there a way that we can use a real number to replace them whether itamp;#39;s either a or b and find that the answer becomes und