Okay, I have the first step, but after that, they ask me to expand and I'm not sure where they're getting the next numbers from.

Original question:
(-3- sqrt(-7))^2

Now, my first step should be:
(-3-i sqrt(7))^2

After that, I'm lost. I see what they're doing after that, but I don't know where the numbers are coming from or how to recreate the answer.

Help, please. :)
Thank you!

3 answers

(A+B)^2=A^2+2AB+B^2

sqrt(A)^2=A

(-A)^2 = A^2

See if you can get further with these hints.
I still don't see where it's coming from. I'm sorry. :)
(-3-iāˆš7)^2
= 9 + 6iāˆš7 + i^2(7) , but i^2 = -1
= 9 + (6āˆš7)i - 7
= 2 + (6āˆš7)i

Notice I followed exactly the steps that MathMate had outlined for you.