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

Algebra.Com
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(75887)   (Show Source): You can put this solution on YOUR website!
You are correct. The book is wrong.
Cheers,
Stan H.

RELATED QUESTIONS

I am stuck on correct answer for: If x is directly proportional to y and x = 3 when y... (answered by Cintchr)
I am stuck on correct answer for: (y - 3x)^2 = I believe the answer is y^2 - 6xy -... (answered by Professor Goode)
I am stuck on correct answer for: 2 to the power of negative 3 = I think it equals... (answered by anjulasahay)
I am stuck on correct answer for: one of the factors of x^2 + x - 6 is: I believe... (answered by Professor Goode)
I am stuck on correct answer for: if x = 3 and y = -2, then -xy^2 = I believe the... (answered by Professor Goode)
What is the f^-1(x) or the inverse of 10x+3/3x+5? I keep getting (5x+3)/(3x+10)...not... (answered by Gogonati)
I am stuck on correct answer for: 9x - 7y - x + 4y = I believe the answer is 8x - (answered by rapaljer)
If x=-1, and y=3 what is the value of the expression 3x(to the third) - 2xy I keep... (answered by richwmiller)
Assume f(x) = x^2 + 4 find the functional value (f-6) f(-6) = -6^2 + 4 f(-6) = 36 + 4 (answered by ewatrrr)