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Easy math but hard for me?

having a hard time with this one as well

(2 - 6i) (5 + i) i got... = -10 - 11i - 6i ^2 = -10 - 11i - 6(-1) = -10 - 11i + 6 = -4 - 11i

In the example, the guy had -7 and 2 as the last number in each parentheses and he got -9 and I have no clue how to get that middle number which is probably why I missed this problem.

it was wrong. I don't mean to depend on you guys to give me the right answer, but I am a person who makes A's in everything else but went to summer school multiple times to pass high school math courses. And as i've said before I am in a program that pays for my college but only a certain number of classes so I'd hate to fail College Algebra the third time and yet again get closer to my class amount limit.

Thank you guys for helping me.

3 Answers

Relevance
  • 9 years ago
    Favorite Answer

    (2 - 6i) (5 + i)=10+2i-30i-6i^2=16-28i

    ~David

  • 9 years ago

    Use foil.

    (2 - 6i) (5 + i)

    = 10 + 2i - 30i - 6i^2

    = 10 - 28i - 6i^2

    = 2(5 - 14i - 3i^2)

  • Anonymous
    9 years ago

    10-28i-6i^2

    2(5-14i-3i^2)

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