How do you determine if a function is one-to-one when preparing precalculus problems?
Answer 1
James Garner
To determine if a function is one-to-one, use the Horizontal Line Test: a function is one-to-one if no horizontal line intersects its graph more than once. Alternatively, show that if f(a) = f(b), then a = b, or verify that the function is strictly increasing or decreasing.
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