Posted by **Anonymous** on Monday, May 23, 2011 at 9:58am.

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

- math -
**bobpursley**, Monday, May 23, 2011 at 10:03am
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)

## Answer this Question

## Related Questions

- math - write the expression as a complex number in standard form 1+2i ----- 3-8i
- MATH - Write the following expression as a complex number in standard form. 2-7i...
- Algebra 2 - Write the Expression as a complex number in standard form. 5i(3+2i...
- Algebra - Write the expression as a complex number in standard form. (2-3i)-(6-...
- Algebra 2 - Write the expression as a complex number in standard form. (5-2i)-2(...
- Algebra - Write the expression as a complex number in standard form. ____5____ 2...
- Algebra 2 - Write the expression as a complex number in standard form. 3-3i/4i I...
- trigonometry - 1)Solve and write in standard form: 4x^2-4x+21=0 2)Find the ...
- Algebra 2 - Dividing: Write the expression as a complex number in standard form ...
- math - write number as a complex number in standard form 6i + (-2 -7i)

More Related Questions