SOLUTION: Find the value of the polynomial. –x2 + 3x – 1 when x = 4.

Algebra ->  Rational-functions -> SOLUTION: Find the value of the polynomial. –x2 + 3x – 1 when x = 4.      Log On


   

Question 117800: Find the value of the polynomial.
–x2 + 3x – 1 when x = 4.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
f%28x%29=-1x%5E2%2B3x-1 Start with the given function.


f%284%29=-1%284%29%5E2%2B3%284%29-1 Plug in x=4. In other words, replace each x with 4.


f%284%29=-1%2816%29%2B3%284%29-1 Evaluate %284%29%5E2 to get 16.


f%284%29=-16%2B3%284%29-1 Multiply -1 and 16 to get -16


f%284%29=-16%2B12-1 Multiply 3 and 4 to get 12


f%284%29=-5 Now combine like terms


So when x=4, the value of the polynomial is -5