Question

6. (i) 9(x + y)2 – x2​

Answer 1

Answer:

9(x+y)²-x².

9(x²+2xy+y²)-x². (Because (a+b)²=a²+2ab+b² where a=x & b=y).

9x²+18xy+9y²-x².

9x²-x²+18xy+9y².

8x²+18xy+9y².

I think this is your answer.