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Given that f(x)=4X-12, what was the input for the function so that f(x)=8?

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1 Answer

f(x) = f(x)                      Reflexive property

4x -12 = 8                     Substitute the two values of f(x) that you know

4x = 20                         Add 12 to each side

x = 5                             Divide each side by 4