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Mathematics 20 Online
OpenStudy (anonymous):

If f(x) = 2x − 4 and g(x) = x2 − 4x, find f(). ***for exponents, such as a-squared, type a^2 (use the carrot)

OpenStudy (lopezking1):

f(x^2-4x)=2x^2-8x-4

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