Question

Help please
Image below c:

Answer 1

Is it b? o;

Answer 2

It's the last one.

Answer 3

how ._.

Answer 4

its option D...

in B 1st match the 1st term and feel the difference..

Answer 5

I would see where you get B, the first 2 was changed to a negative

Answer 6

oh o;

Answer 7

thanks c;

Answer 8

You don't want to complicate it more then you have to, so try to keep the first equation the same. - * - = +, so you want the equation wuth +a^2, -2ab and +2b^2. Or D indeed