sighn0more
  • sighn0more
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?
Mathematics
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sighn0more
  • sighn0more
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?
Mathematics
katieb
  • katieb
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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anonymous
  • anonymous
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anonymous
  • anonymous
It 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
  • anonymous
|dw:1442776196409:dw|

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sighn0more
  • sighn0more
OH! They just didn't show the 1 in the example because it's understood. I think I get it now.
anonymous
  • anonymous
:) exactly because 1 times 2^x is still 2^x. Okay that's good for you. see you around! Goodluck :)
sighn0more
  • sighn0more
Thank you!!

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