posted by .

Can someone walk me through these becuase I'm just not getting it....

Let f(x)= 3 x 4^x.

A.) 16f(x)= f(x+2)
B.) f(x)= f(x-1)

The quickest way to answer this question is to try different test values for x.

My favorite was the number 13.

Set x to 13, and see if A and/or B hold true.

You should also test with x as some other arbitrary values, such as pi or -1.

I don't think I'm really getting what you are saying. I thought that we were supposed to plug in 3 x 4^x in for f(x) in the equation, but after that point I get really confused....

For A.) with what we're given for f(x), we have 16*(3*4^x)=3*4^(x+2) or
48*4^x=3*4^x *4^2=48*4^x This appears to be true for all x therefore A) is an identity.
For B.) we have 3*4^x=3*4^(x-1) or
4^x=4^(x-1), or 4^x=4^x *(1/4) Can any x satisfy this equation?
You should observe that we look at what's in the placeholder for the argument x and substitute that into the expression; (x+2) in part A and (x-1) in part B.

Thanks,this really helped me

what word do you call the numbers that can`t be arranged into 2-row arrays

I thought someone answered this below -and correctly too I might add.
It would be a two row matrix, but you would still need to specify the number of columns as well.
The term array is more commonly used in computer science, while matrix is more common to math, specifically linear algebra. I'm not aware of any significant difference between the two terms either.

what is an array

arrays are arranged dots that are like 2*8
array would have 16 dots.

it's hard to explain!


Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Drugs

    I asked a question earllier related to whether my idea of an inhalant was correct or not. Someone mentions something about vehicle. my question is: vehicle?
  2. science

    The ozone's hole is supposably getting bigger, but is it really?
  3. alg

    if n+5-n+3 over n-3-n-5=16 what is the value of n this is an SAT question and i just cant seem to figure it out..even with pluggin in the numbers it never = help pls..what is the quickest way in solving this for the SAt's
  4. physics - please explain further

    Can someone please explain the answer I got for a question I previously posted on this page?
  5. Math : Algebra

    I have a whole page of questions I'm trying to complete that are similar to this, but no idea how to do them. If someone could give me a walk through of this question I'd be very appreciative. I'm just suppose to solve the equation. …
  6. HELP!! MATH

    A boater finds herself 4 miles fromm the nearest point on a straight shore line whech is 6 miles from a shoreside motel. She plans to row on shore and then walk to a motel. If she can walk at 3 mph, at what speed must she be able to …
  7. Math

    Can someone please walk me through this? i don't want the answer..........just a walk through. Quiz tommorrow. 2 + 5(9x - 6) = 14
  8. Math

    Hi I wanted some help with this question, I don't want the answer though as I want to try to see where my workings are going wrong. 3 x 34 / 9 - 2 (10 - 6) - 4 / 2 A -13 B 5 C 6 D -14 But I'm getting -3. Here's how I work through the …
  9. Math

    A student answered the following skill-testing question to try and win a prize: (-4)^3-(-2)^4/2^2+5^2*7^0 The students answer was 5. Did the student win the prize?
  10. Math

    I need help on a math question. can someone walk me through the process?

More Similar Questions