Question

expand :(a+1)(a-1)
please give right answer ​

Answer 1

Answer:

a^2 - 1^2

i.e a^2 - 1

Step-by-step explanation:

a square - 1 square

Answer 2

Answer:

(a whole square minus 1 whole square)

Step-by-step explanation:

it is the correct answer.

create by rule of mathematics.