f(x) = x^2 + 3&amp;#10;&amp;#10;(A) f(-2) = (-2)^{2} + 3 = 4 + 3 = 7 \\ \\ (B) f(1/2) = (1/2) ^ {2} + 3 = 1/4 + 3 = 13/4 \\ \\ (C) f(b) = b^{2} + 3