Question

Which of the following is correct ?
1.(a-b)2=a2+2ab-b2
2.(a-b)2=a2-2ab+b2
3.(a-b)2=a2-b2
4.(a+b)=a2+2ab-b2

Answer 1

Answer:

2

Step-by-step explanation:

Answer 2

Answer:

2- (a-b)^2= a^2+b^2-2ab