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a. f(4) = 4^2 - 4(4) + 3 = 3
b. f(4 + h) = (4 + h)^2 - 4(4 + h) + 3
= 16 + 8h + h^2 - 16 - 4h + 3
= h^2 + 4h + 3
c. f(4 + h) - f(4) = (h^2 + 4h + 3) - 3 = h^2 + 4h