A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
This is a worked example of an expression containing exponents from my IB workbook:
a) (2^x + 3)(2^x + 1)
= 2^x * 2^x + 2^x + 3 * 2^x + 3
= 2^2x + 4 * 2^x + 3
= 4^x + 2^2+x + 3
I understand everything except for how they got the 4 in step 2. Can someone please help me understand this?
anonymous
 one year ago
This is a worked example of an expression containing exponents from my IB workbook: a) (2^x + 3)(2^x + 1) = 2^x * 2^x + 2^x + 3 * 2^x + 3 = 2^2x + 4 * 2^x + 3 = 4^x + 2^2+x + 3 I understand everything except for how they got the 4 in step 2. Can someone please help me understand this?

This Question is Closed

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1442775971750:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It is like when you use FOIL in multiplying binomial expressions. They get 4•2^x from the Outers and Inners like what I showed above..

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1442776196409:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0OH! They just didn't show the 1 in the example because it's understood. I think I get it now.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0:) exactly because 1 times 2^x is still 2^x. Okay that's good for you. see you around! Goodluck :)
Ask your own question
Sign UpFind more explanations on OpenStudy
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.