anonymous
  • anonymous
Multiply. 1.) 7i (3-7i) 2.) (4+3i) (3-3i)
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
1.) 7i (3-7i)=7i *3 - 7i * 7i = 21i - 49*i^2=49+21i ; 2.) (4+3i) (3-3i) = 4*3+4*(-3i)+3i*3+3i*(-3i)=12-12i+9i-9*i^2=12-3i+9=21-3i
anonymous
  • anonymous
is that by rationalizing ?
anonymous
  • anonymous
ah, rationalizing is a process to turn the denominator which is probably not a rational to a national.

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anonymous
  • anonymous
rational,...
anonymous
  • anonymous
rational,...
anonymous
  • anonymous
so if i wanted to rationalize 10/1+3i ?
anonymous
  • anonymous
you mean 10/(1+3i)?? you'd better use the brackets to avoid misunderstanding
anonymous
  • anonymous
and same process if i want to add or subtract ?
anonymous
  • anonymous
yes 10/(1+3i), sorry i've never done math online
anonymous
  • anonymous
you understand the two methods: traditional one, and rationalization??
anonymous
  • anonymous
rationalization is longer ?

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