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The table shows a pattern of exponents. what is the pattern as the exponents decrease?

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9