Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
blkbutterfly13
Group Title
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.
 2 years ago
 2 years ago
blkbutterfly13 Group Title
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.
 2 years ago
 2 years ago

This Question is Closed

HawkCrimson Group TitleBest ResponseYou've already chosen the best response.0
to put it simplly (x+1)(x2) must be equal to "0" not 4 for that method to work so that is y he is wrong
 2 years ago

HawkCrimson Group TitleBest ResponseYou've already chosen the best response.0
what you must do is this (x+1)(x2)=4 x^2x2=4 x^2x6=0 (x+2)(x3)=0 therefore x=2 or x=3
 2 years ago

HawkCrimson Group TitleBest ResponseYou've already chosen the best response.0
understood?
 2 years ago

blkbutterfly13 Group TitleBest ResponseYou've already chosen the best response.0
yes thanks
 2 years ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.