Question: 3. Consider the function f : R2 -> R defined by f (s, t) = s2 - t2. (a) Prove that f is surjective. (b)

3. Consider the function f : R2 -> R defined by

f (s, t) = s2 - t2. (a) Prove that f is

3. Consider the function f : R2 -> R defined by f (s, t) = s2 - t2. (a) Prove that f is surjective. (b) Is f injective? Explain your reasoning

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