a) just plug in -2 for x
b) set 8-4x = 8 and solve for x
c) http://www.wolframalpha.com/input/?i=plot+y%3D+8-4x
d) set of real numbers for both
e) and f), use the graph I gave you
Given: f(X)= 8-4x
A. Find f(-2)
B. Find x, when f(x)= 8
C. Graph the function.
D. State the domain and range of the function.
E. Use the graph to find x, when f(x) = 0 . Show details on the graph.
F. Use the graph to find f(x)when x = 3. Show details on the graph.
2 answers
the domain of all polynomials is all real numbers.
f(x) = 8-4x.
So, for f(-2), replace every x with -1:
f(-2) = 8-4(-2) = 8+8 = 16
To graph the function, you just need two points. You already have (-2,16). So, pick any other value for x (0 is an easy one!) and plot (0,f(0)).
Draw the line between the two points. The rest should be easy.
f(x) = 8-4x.
So, for f(-2), replace every x with -1:
f(-2) = 8-4(-2) = 8+8 = 16
To graph the function, you just need two points. You already have (-2,16). So, pick any other value for x (0 is an easy one!) and plot (0,f(0)).
Draw the line between the two points. The rest should be easy.
0 answers