self Maths Puzzle

A number 'a' lies between 2 and 3 (including 2,3). and number 'b' lies between 4 and 6(including). wat is the minimum and maximum value of a^2-b^2 ?

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self Other Question

81,41,42,64.5,___,330. 2 persons shyam and murali starts walking from the same point.shyam goes 4m towards east and turns left and walks 4m.murali walks towards 3m west and walks 4m right.what is the distance between them at this point ?