1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Simplifying an expression

  1. Apr 5, 2006 #1
    Well here is the beginning of it:

    [-6(-4)^(n-1)] - 9 + [8(-4)^(n-2)] + 12

    This is suppose to simplify to 2(-4)^2 + 3.

    But I have no idea how that 2(-4)^2 was obtained. Could anybody explain how that would work?
  2. jcsd
  3. Apr 5, 2006 #2
    i'm going to assume you meant 2(-4)^n not ^2, because otherwise you'd've simplified further, and besides, ^n is the correct answer. do you know how exponentials work and how to factor? thats all they did, and then simplified.

    use these rules:

    X^(a+b) = (X^a)(X^b)
    and by that:
    X^(a+b) + X^(a+c) = X^a(X^b + X^c)
  4. Apr 6, 2006 #3


    User Avatar
    Staff Emeritus
    Science Advisor

    It also helps to know that 4= 2^2!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Simplifying an expression
  1. Simplifying expression (Replies: 1)

  2. Simplify an expression (Replies: 15)