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sighn0more
 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?
sighn0more
 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?

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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

sighn0more
 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 :)
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