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4 cards from this section. Quick, good the night before a test.
Define a function in your own words.
Think about mappings between sets.
What is the domain of the function f(x) = x^2?
Consider what values x can take.
What is the set of inputs for a function known as?
Think of where the inputs come from.
True or False: A bijective function must always be injective.
Consider the definitions of injective and bijective.
Consider the function f(x) = x^2 defined on the domain [-2, 2]. Identify the range. What type of function is it?
Think of the values that x can take.
If h(x) = 2x + 1 and k(x) = (x - 1)/2, prove that k is the inverse of h.
Evaluate both compositions and simplify.
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