Question

solve using identities 84 x 83​

Answer 1

84×83

(84)(83)

(80+4)(80+3)

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

= (80)^2+80(4+3)+4×3

= 6400+560+12

= 6972

Answer 2

Answer:

12012

Step-by-step explanation:

1. (80+4)X(80+3)       using (x+a)(x+b)=x^2+x(a+b)+ab
2. 80^2+80(4+3)+4X3
3. 6400+80X7+12
4. 6400+560+12
5. 6972