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anonymous

  • 5 years ago

Multiply. 1.) 7i (3-7i) 2.) (4+3i) (3-3i)

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  1. anonymous
    • 5 years ago
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    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

  2. anonymous
    • 5 years ago
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    is that by rationalizing ?

  3. anonymous
    • 5 years ago
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    ah, rationalizing is a process to turn the denominator which is probably not a rational to a national.

  4. anonymous
    • 5 years ago
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    rational,...

  5. anonymous
    • 5 years ago
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    rational,...

  6. anonymous
    • 5 years ago
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    so if i wanted to rationalize 10/1+3i ?

  7. anonymous
    • 5 years ago
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    you mean 10/(1+3i)?? you'd better use the brackets to avoid misunderstanding

  8. anonymous
    • 5 years ago
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    and same process if i want to add or subtract ?

  9. anonymous
    • 5 years ago
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    yes 10/(1+3i), sorry i've never done math online

  10. anonymous
    • 5 years ago
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    you understand the two methods: traditional one, and rationalization??

  11. anonymous
    • 5 years ago
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    rationalization is longer ?

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spraguer (Moderator)
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