The number –5 is in the range of the function f(x) = 4x – 9. Find an element in the domain that corresponds to –5 and show as an ordered pair.
2006-11-27 07:15:25 · 3 answers · asked by Dianna 4 in Science & Mathematics ➔ Mathematics
Range would be the set of values for f(x)
Domain would be the set of values for x
So they want you to take your equation...
f(x) = 4x - 9
...and set the value of f(x) to -5:
-5 = 4x - 9
Now you need to solve for x as follows:
Add 9 to both sides:
4x = -5 + 9
Simplify:
4x = 4
Divide both sides by 4:
x = 1
x = 1, f(x) = -5
So your ordered pair is (1, -5)
2006-11-27 07:17:54 · answer #1 · answered by Puzzling 7 · 1⤊ 1⤋
-5 = 4x - 9
4 = 4x
x = 1
(1, -5)
2006-11-27 07:18:21 · answer #2 · answered by Jim Burnell 6 · 0⤊ 1⤋
f(Xo)=-5 (=) 4Xo-9=-5 (=) Xo=1 (Df=R)
so A(1,-5)
2006-11-27 07:19:10 · answer #3 · answered by vicalkalais 2 · 0⤊ 0⤋