1. Not finding help here? Sign up for a free 30min 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!

Adding exponents

  1. Nov 10, 2004 #1
    Well it appears that as i get higher in math, i lose the stuff i learned awhile ago. This type has me stumped for some reason.

    x^3 + X^5=0 Or another one X^3 + x^4=0

    I can break them down to X^3(1+X^2)=0 or X^3(X +1)=0

    I just can seem to solve these simple guys.
  2. jcsd
  3. Nov 10, 2004 #2


    User Avatar
    Gold Member

    I'm not sure where you're having problems.

    x3(1 + x2)=0
    x3=0 or 1 + x2=0
    x=0 (Assuming you only want real solutions)
  4. Nov 10, 2004 #3
    Hmm found something but cant explain the rule (help explaining please)

    Got it to X^3(1+X)=0

    for some reason you break it down to 2 solutions
    x^3=0 and 1+x=0

    since the first one doesnt work, the second one is the answer, which i can solve. X=-1
  5. Nov 10, 2004 #4


    User Avatar
    Gold Member

    The first one solves for x=0
  6. Nov 10, 2004 #5


    User Avatar
    Science Advisor
    Homework Helper

    If a*b=0 then it is obvious that either a=0, b=0 or a and b=0. So you need to look at both a being 0 or b being 0. This is why in general in maths we like things to equal 0 so we can solve them. For example a*b=1 doesn't tell us anything about a or b.
  7. Nov 10, 2004 #6
    Thanks guys, due to a brain fart this problem took me like 30min cuz i didnt factor, then i couldnt remember the zero thing till about 10min ago. I thought im gona be a garbage man after this simple brain freeze. Last brain freeze was adding two digit number:)
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Adding exponents
  1. Exponent H.W. (Replies: 1)

  2. Laws of Exponents (Replies: 3)

  3. Exponents ! Help! (Replies: 11)

  4. Exponent Help (Replies: 8)

  5. Adding Vectors (Replies: 1)