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f(1) = 1 - (1)^2 = 1 - 1 = 0
f(-2) = 1 - (-2)^2 = 1 - 4 = -3
f(1/4) = 1 - (1/4)^2 = 1 - 1/16 = 15/16
f(1 + h) - f(1) = [1 - (1 + h)^2] - [0]= 1 - (1 + 2h + h^2) = h^2 + 2h
f(1 + h) = 1 - (1 + h)^2 = 1 - (1 + 2h + h^2) = h^2 + 2h