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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?

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  1. anonymous
    • one year ago
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    |dw:1442775971750:dw|

  2. anonymous
    • one year ago
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    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..

  3. anonymous
    • one year ago
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    |dw:1442776196409:dw|

  4. sighn0more
    • one year ago
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    OH! They just didn't show the 1 in the example because it's understood. I think I get it now.

  5. anonymous
    • one year ago
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    :) exactly because 1 times 2^x is still 2^x. Okay that's good for you. see you around! Goodluck :)

  6. sighn0more
    • one year ago
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    Thank you!!

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