SOLUTION: f(x)=5x^2-3x, what is the value of f(3)? i am practicing for the SAT i keep getting 36 and the book say the correct answer is 18

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Question 28911: f(x)=5x^2-3x, what is the value of f(3)?
i am practicing for the SAT i keep getting 36
and the book say the correct answer is 18
Answer by stanbon(48558) About Me  (Show Source):
You can put this solution on YOUR website!
You are correct. The book is wrong.
Cheers,
Stan H.