Question

Evaluate the following

81^2 - 80^2​

Answer 1

Answer:

(80+1)^2-80^2

80^2+1+160-80^2

161

Answer 2

Step-by-step explanation:

81^2=(80)^2

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

(80+1)^2

(80)^2+(1)+2(80)(1)

6400+1+160

6561