# Let A = {–1, 0, 1

It is given that A = {–1, 0, 1, 2}, B = {– 4, – 2, 0, 2}

And also, it is given that f, g: A B be functions defined by f (x) = x2 – x, x A and , x A

We can see that

f(-1) = (-1)2 – (-1) = 1 + 1 = 2

f(-1) = g(-1)

f(0) = (0)2 – 0 = 0 + 0 = 0

f(0) = g(0)

f(1) = (1)2 – 1 = 1- 1 = 0

f(1) = g(1)

f(2) = (2)2 – 2 = 4- 2 = 2

f(2) = g(2)

Thus, f(a) = g(a) . a ϵ A

Therefore, the functions f and g are equal.

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