please help which is a and which is b

Question

Evaluate the expression  and write the result in the form .

Answer 1

The sqrt(-5) is i*sqrt(5). Similar all other roots.

So we have

i*sqrt(5) * i*sqrt(4) * i*sqrt(3) = i³* sqrt(5*4*3) = i²*i*sqrt(60)

Notice that I replaced i³ with i²*i, so that we can replace i²=-1

= -sqrt(60)*i

If we need to represent the complex number as (a+bi), we have

=(0 - sqrt(60)*i)

so

a=0 and b=-sqrt(60)