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I don't get this problem

If f(x)= x²-3x-6, then find 6-2f(x)

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Arturo O. | Experienced Physics Teacher for Physics TutoringExperienced Physics Teacher for Physics ...
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Just plug the expression for f(x) into 6 - 2f(x) and simplify.
 
6 - 2f(x) = 6 - 2(x2 - 3x - 6) = ?
 
You should be able to finish from here.