I forgot how to do this stuff! I'm trying to review old material and i forgot.
Please explain.
f(x) = 20x - 4, for x = -2 and x=8
2006-07-06 08:26:12 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
It just means to substitute each given value of x into the equation, and solve.
f(-2) = 20*(-2) - 4
= -40 -4
= -44
f(8) = 20*8 - 4
= 160 - 4
= 156
2006-07-06 08:30:11 · answer #1 · answered by -j. 7 · 0⤊ 1⤋
Simple: you just substitute for x in the function.
So f(x) = 20x - 4
when x = -2 this is 20(-2) - 4 = -44
and
when x = 8 this is 20(8) -4 = 156
2006-07-12 00:46:36 · answer #2 · answered by Anonymous · 0⤊ 0⤋
These are simple... plug in what x is equal to wherever you see x... so,
f(-2) = 20x - 4 = 20(-2) - 4 = -40 - 4 = -44
f(8) = 20x - 4 = 20(8) - 4 = 160 - 4 = 156
2006-07-06 08:31:10 · answer #3 · answered by blink182fan117 4 · 0⤊ 0⤋
It is a simple substitution in both cases:
For x= -2,
20x - 4 = 20(-2) - 4 = -40 - 4 = -44
For x=8,
20x - 4 = 20(8) - 4 = 160 - 4 = 156
Hope this helps!
2006-07-06 08:32:00 · answer #4 · answered by theanonymousthinker 1 · 0⤊ 0⤋
Evaluate Each Function
2017-01-13 12:22:53 · answer #5 · answered by troxell 4 · 0⤊ 0⤋
f(-2) = (20)(-2) - 4 = 20 times -2 minus 4
= -44
f(8) = (20)(8) - 4 = 20 times 8 minus 4
= 156
2006-07-06 08:30:57 · answer #6 · answered by Darth_Rambo 1 · 0⤊ 0⤋
you take x and plug it in both values 20(-2) -4 and 20(8)-4
2006-07-06 08:30:05 · answer #7 · answered by Anonymous · 0⤊ 0⤋
f(-2)=20(-2)-4=-40-4=-44
f(8)=20(8)-4=160-4=156
Just plug it in.
2006-07-06 08:30:55 · answer #8 · answered by kooshman38 3 · 0⤊ 0⤋
f(-2)=20*(-2)-4=-44
f(8)=20*8-4=156
2006-07-06 10:52:22 · answer #9 · answered by sgm 1 · 0⤊ 0⤋