anonymous
  • anonymous
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.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@dan815
anonymous
  • anonymous
Can you help me, I just need some basic knowledge of this
anonymous
  • anonymous
ganeshie8

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dan815
  • dan815
|dw:1435335636769:dw|
dan815
  • dan815
|dw:1435335751119:dw|
dan815
  • dan815
okay so uhh, they say replace the 10s with xs
dan815
  • dan815
is there some typo in the question or something
dan815
  • dan815
because that is definately not the result of 21*12
anonymous
  • anonymous
ok thank and how is the normal integer multipication method similar to FOIL
anonymous
  • anonymous
No i dont think there is a typo
dan815
  • dan815
okay well you see you can do foil stuff with integer multiplication
dan815
  • dan815
for example 21* 12 = (20+1) * (10 +2 )
anonymous
  • anonymous
wow ok tht helps
dan815
  • dan815
so if you break that up further you get this
dan815
  • dan815
(20+1) * (10 +2 ) = 20*(10+2) + 1*(10+2) = 20*10 + 20*2 + 1*10 + 1*2 =200 +40 + 10 + 2 = 252
dan815
  • dan815
Foil is a formula that is like a shortcut to this expansion
dan815
  • dan815
nvm, i dont wanna overload you with this stuff, its pointless
dan815
  • dan815
it's just expanding brackets thats all you need to know
anonymous
  • anonymous
no i think i get the basics of this now at least
anonymous
  • anonymous
Thank you!!
anonymous
  • anonymous
I was totally confused at first
dan815
  • dan815
okay then great :)

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