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anonymous

  • one year ago

Anyone please help me Expanding each integer in the expression 21 × 12, the result is [(2 × 101) + (1 × 100)] × [(1 × 101) + (2 × 100)]. Replace the 10s with x’s and then multiply this expression using FOIL. Compare it with the normal integer multiplication method used above: How are they similar? Show your work.

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  1. anonymous
    • one year ago
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    @dan815

  2. anonymous
    • one year ago
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    Can you help me, I just need some basic knowledge of this

  3. anonymous
    • one year ago
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    ganeshie8

  4. dan815
    • one year ago
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    |dw:1435335636769:dw|

  5. dan815
    • one year ago
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    |dw:1435335751119:dw|

  6. dan815
    • one year ago
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    okay so uhh, they say replace the 10s with xs

  7. dan815
    • one year ago
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    is there some typo in the question or something

  8. dan815
    • one year ago
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    because that is definately not the result of 21*12

  9. anonymous
    • one year ago
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    ok thank and how is the normal integer multipication method similar to FOIL

  10. anonymous
    • one year ago
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    No i dont think there is a typo

  11. dan815
    • one year ago
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    okay well you see you can do foil stuff with integer multiplication

  12. dan815
    • one year ago
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    for example 21* 12 = (20+1) * (10 +2 )

  13. anonymous
    • one year ago
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    wow ok tht helps

  14. dan815
    • one year ago
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    so if you break that up further you get this

  15. dan815
    • one year ago
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    (20+1) * (10 +2 ) = 20*(10+2) + 1*(10+2) = 20*10 + 20*2 + 1*10 + 1*2 =200 +40 + 10 + 2 = 252

  16. dan815
    • one year ago
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    Foil is a formula that is like a shortcut to this expansion

  17. dan815
    • one year ago
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    nvm, i dont wanna overload you with this stuff, its pointless

  18. dan815
    • one year ago
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    it's just expanding brackets thats all you need to know

  19. anonymous
    • one year ago
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    no i think i get the basics of this now at least

  20. anonymous
    • one year ago
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    Thank you!!

  21. anonymous
    • one year ago
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    I was totally confused at first

  22. dan815
    • one year ago
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    okay then great :)

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