Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

blkbutterfly13

  • 3 years ago

In solving the equation (x + 1)(x – 2) = 4, Eric stated that the solution would be x + 1 = 4 => x = 3 or (x – 2) = 4 => x = 6 However, at least one of these solutions fails to work when substituted back into the original equation. Why is that? Please help Eric to understand better; solve the problem yourself, and explain your reasoning.

  • This Question is Closed
  1. HawkCrimson
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    to put it simplly (x+1)(x-2) must be equal to "0" not 4 for that method to work so that is y he is wrong

  2. HawkCrimson
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what you must do is this (x+1)(x-2)=4 x^2-x-2=4 x^2-x-6=0 (x+2)(x-3)=0 therefore x=-2 or x=3

  3. HawkCrimson
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    understood?

  4. blkbutterfly13
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes thanks

  5. HawkCrimson
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    :)

  6. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy