math

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

  1. 👍 0
  2. 👎 0
  3. 👁 66
  1. 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

Your Response

Similar Questions

  1. Algebra 2

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

    asked by Kaitlyn on September 22, 2014
  2. MATH

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

    asked by Emmett on August 11, 2012
  3. math

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

    asked by princess on January 3, 2009
  4. Algebra

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

    asked by Lily on November 16, 2010
  5. Algebra

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

    asked by Emma on March 26, 2013
  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?

    asked by Jennie on December 8, 2011
  7. 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.

    asked by Kiley on November 3, 2008
  8. 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

    asked by Linda on November 20, 2011
  9. 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!

    asked by mikey on December 3, 2012
  10. Trigonometry

    Write each expression in the standard form for a complex number, a + bi. A. [3(cos(27°)) + isin(27°)]^5 B. [2(cos(40°)) + isin(40°)]^6 For A i got 2.67+1.36i and for B i got 1.53+1.29i

    asked by Kyle on April 18, 2016

More Similar Questions