2x-9y and 11x + 3y - 12y - 9x
Answer:
wrong
Step-by-step explanation:
(a+b)^2=(a+b)(a+b)
=a(a+b)b(a+b)
=a^2+ab+ab+b^2
=a^2+2ab+b^2
i hope it helps you
Answer:
It should be the last one, She made a sign error when multiplying.
Answer:
=
Step-by-step explanation:
