Can someone please explain this to me

I'm not sure I understand either have you tried the hint or video button or did that help ?

ok so to answer this question you do 2xd d=8 so you would do 2x8 which is 16 then add 3 which is 19

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

the answer is simply just 6n add the two together as they have an n