SOLUTION: Please help me. perform the indicated operation. write the result in the form a + bi. (5i)(-4i)

Algebra.Com
Question 453281: Please help me. perform the indicated operation. write the result in the form
a + bi. (5i)(-4i)

Answer by CubeyThePenguin(3113)   (Show Source): You can put this solution on YOUR website!
Remember that i^2 = -1.

(5i)(-4i)
= -20i^2
= 20

RELATED QUESTIONS

Perform the indicated operation. Write the result in the form a + bi. 4i + (-5... (answered by Nate)
Please help me. Perform the indicated operation. Write the result in standard form.... (answered by jim_thompson5910)
Perform the indicated operation and express the results as a simplified complex number.... (answered by ankor@dixie-net.com)
perform the indicated operation and write the result in standard form:... (answered by stanbon)
Perform the indicated operation 7. (4-2i)(8+4i) Simplify and write in a+bi form... (answered by lwsshak3)
Perform the indicated operation. Write the result in the form a + bi Show work. (6 +... (answered by bucky)
Please help. Perform the indicated operation. Write the result in standard form.... (answered by jim_thompson5910)
it says perform the indicated operation, and write the result in the standard form a+bi.... (answered by ptaylor)
perform the indicated operation and express each answer in a+bi form 1) (1/5... (answered by ewatrrr)