SOLUTION: Hello, Kristin needs more help w/ a practice problem: f(x)=x^2 - kx - 3 and f(2)=9, then k= -Thanks, Kristin

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: Hello, Kristin needs more help w/ a practice problem: f(x)=x^2 - kx - 3 and f(2)=9, then k= -Thanks, Kristin      Log On


   

Question 31241: Hello,
Kristin needs more help w/ a practice problem:
f(x)=x^2 - kx - 3 and f(2)=9, then k=
-Thanks,
Kristin
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
+f%28x%29=x%5E2+-+kx+-+3+.

So, when f(2)=9 we get +9=%282%29%5E2+-+k%282%29+-+3+

...you carry on and get the value of k.

jon