SOLUTION: Perform the indicated operations and write the result in standard form. (-4 -sqrt(-5))^2 I get 8i sqrt(5), but mymathlab is telling me its wrong. My teacher has it set up so

Algebra ->  Complex Numbers Imaginary Numbers Solvers and Lesson -> SOLUTION: Perform the indicated operations and write the result in standard form. (-4 -sqrt(-5))^2 I get 8i sqrt(5), but mymathlab is telling me its wrong. My teacher has it set up so       Log On


   

Question 898350: Perform the indicated operations and write the result in standard form.
(-4 -sqrt(-5))^2
I get 8i sqrt(5), but mymathlab is telling me its wrong. My teacher has it set up so there is a limited amount of attempts so I need help for this. Thanks
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
You most likely know how to square a binomial.

%28%28-4%29-sqrt%28-5%29%29%5E2
%28-4%29%5E2-%28-4%29sqrt%28-5%29-%28-4%29sqrt%28-5%29%2B%28-5%29
16%2B4sqrt%28-5%29%2B4sqrt%28-5%29-5
8sqrt%28-5%29%2B11
11%2B8sqrt%28-5%29, or to use i%5E2=-1,
highlight%2811%2B8i%2Asqrt%285%29%29