Question

find the square of 89 by using identity​

Answer 1

Answer:

89 ^2

89×89

7921...........

Answer 2

Answer:

step-by-step explanation :

(a-b) whole square = a square + b square - 2ab

=Let a = 90

and b = 1

=(90-1) whole square = 90 square + 1 square -2(90)(1)

= 8100 + 1 - 180

= 7921

Verification :

(89)(89) = 7921

Your answer is solved.