I need to evaluate the epression f(x) = 3x + 20 over x ,for x = 4, can anyone help with this? I keep coming up with 17, but the choices I have to chose from are
5, -2, 8, or 32. I think it may be 8 but I am unsure thanks for your help
2007-05-31 03:02:08 · 6 answers · asked by ambi565 2 in Science & Mathematics ➔ Mathematics
f(x) = (3x + 20)/x
f(4) = (3*4 + 20) / 4
f(4) = (12 + 20) / 4
f(4) = 32/4
f(4) = 8
you're right
Note: you need to put more parentheses in your expressions for clarity.
That equation can be interpreted the way I wrote it above, or as:
f(x) = 3x + 20/x
They're very different, that's why I got 17 before
2007-05-31 03:09:34 · answer #1 · answered by mark r 4 · 0⤊ 0⤋
f(x)=3x+20 = 3*4+20 = 12+20 =32
2007-05-31 10:15:07 · answer #2 · answered by Key 1 · 0⤊ 0⤋
If you mean
f(x) = 3x + 20/x,
then the solution is f(4) = 3*4 + 20/4 = 12 + 5 = 17, but if you mean
f(x) = (3x + 20)/x
then (in the same way) solution is 8. I think that formulation is a problem.
See you!
2007-05-31 10:14:44 · answer #3 · answered by Alas 2 · 0⤊ 0⤋
for all functions, simply substitute the given variable with the given value:
f(x) = 3x + 20 over x
= [3(4) +20]/4
= 32/4
= 8
ANSWER-- 8
2007-05-31 10:37:48 · answer #4 · answered by clapofthunder 1 · 0⤊ 0⤋
x = 4
so 3(4) + 20 + 12 + 20 + 32
32/4 = 8
2007-05-31 10:09:41 · answer #5 · answered by Lady Geologist 7 · 0⤊ 0⤋
f(x)=(3x+20) /x so f(4)=(3*4+20)/4 f(4)=8
2007-05-31 10:40:09 · answer #6 · answered by sara 3 · 0⤊ 0⤋