Question

calculate (989) square using
alegebraic identitie​

Answer 1

Answer:

978121

Step-by-step explanation:

989= (1000-11)

(989)^2

=(1000-11)^2

= 1000^2- 2(1000)(11)+ 11^2

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

=1000000- 22000+ 121

978121

Answer 2

Answer:

978121

Step-by-step explanation:

989 square =(1000-11)

                    a2-2(a)(b)+b2

                    1000 square -2(1000*11) + 11 square

                     1000000-2(11000)+121

                     1000000-22000+121

                      978121

so by the identity 989 square = 978121

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