math

posted by .

write the expression -5i(1 + 3i) as a complex number in standard form.

  • math -

    well, break it up:

    -5i : 5@-90
    1+3i: sqrt10 @arctan3

    now multiply them

    5sqrt10 @(-90+71.56) now that angle, after adding 360, is 341.56

    5sqrt10 (.9486 -316i)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Algebra 2

    Write the expression as a complex number in standard form. (5-2i)-2(3+i) Please explain how to do this. I don't know how.
  2. math

    write the expression as a complex number in standard form 1+2i ----- 3-8i
  3. Algebra

    Write the expression as a complex number in standard form. (2-3i)-(6-5i)
  4. math

    write number as a complex number in standard form 6i + (-2 -7i)
  5. Algebra 2

    Dividing: Write the expression as a complex number in standard form 1) 2+5i/5+2i 2) 6-i√2/6+i√2 for the first one I solved it and I only got this far: 10+21i-10i^2/25-4i^2
  6. Algebra 2

    Write the expression as a complex number in standard form. 3-3i/4i I'm not sure about this problem, but I think the answer is -3/4i-3/4. Could anyone help me please?
  7. MATH

    Write the following expression as a complex number in standard form. 2-7i/-3+8i
  8. trigonometry

    1)Solve and write in standard form: 4x^2-4x+21=0 2)Find the standard form of the complex number. 8(cos pi/2 + i sin pi/2) Thanks everyone!
  9. Algebra

    Write the expression as a complex number in standard form. ____5____ 2- i =2+5i Did I get the right answer?
  10. Algebra 2

    Write the Expression as a complex number in standard form. 5i(3+2i)(8+3i)

More Similar Questions