2007-10-21 11:25:40 · 5 answers · asked by Anonymous 2 in Science & Mathematics ➔ Mathematics
i meant FIND* f(-2) not fine. sorry.
2007-10-21 11:27:06 · update #1
substitute the value (-2) in for x
f(-2)=-(-2)+4
f(-2)=2+4
f(-2)=6
in case you are just starting functions, the f(x) is just a fancy way of writing y, and since it is f(x), you substitute the (x) part into the equation whenever there is an (x), as shown above
2007-10-21 12:45:35 · answer #1 · answered by yankeesrus07 2 · 0⤊ 0⤋
the symbol x is a placeholder. If you replace x by -2 on the left (so the symbol f(x) becomes f(-2) ), then you replace x by the same quantity on the right (so -x + 4 becomes -(-2) +4 ).
llikewise, f(7) = -7 + 4
f(t) = -t + 4
f( Bob) = -Bob + 4
2007-10-21 11:32:42 · answer #2 · answered by Michael M 7 · 0⤊ 0⤋
First write down f(x)=-x+4.
Then rewrite the equation, replacing every x with a -2:
f(-2)=--2+4
You know what -2 is; can you guess what --2 is?
2007-10-21 11:31:05 · answer #3 · answered by DWRead 7 · 0⤊ 0⤋
f(-2) just means plug the -2 in for every x in the problem.
this means that it is -(-2) +4, or 2+4 =
6, as the final answer.
2007-10-21 11:31:54 · answer #4 · answered by stucongress 1 · 0⤊ 0⤋
just plug in -2 for x
f(-2) = -(-2) + 4
f(-2) = 6
2007-10-21 11:28:46 · answer #5 · answered by gang$tahtooth 5 · 0⤊ 0⤋