Question

plz say the answer step is also needed​

Answer 1

Answer:

→78×82

=(80−2)(80+2)

=80

2

−2

2

=6400−4

=6396

Your second answer

https://www.toppr.com/ask/en-in/question/using-identities-evaluate-89-2/

Iss site pe dekhlo

Answer 2

Answer:

1. 6396 2. 79.21

Step-by-step explanation:

1. 78 x 82

= (80 - 2)(80 + 2)

=${80}^{2} - {2}^{2}$

= 6400 - 4

= 6396 Ans.

2.

${8.9}^{2} ={ (9 - 0.1) }^{2} = {9}^{2} - 1.8 + 0.01 = 81 + 0.01 - 1.8$

= 79.21 Ans.

Hope it would help........