Question

. Use an expansion formula
to find the values of 51^2​

Answer 1

51 can be written as (50 +1)

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

(50+1)^2 =50^2 + 1^2 +2(50)(1)

= 2500+1 +100

= 2601

RECHECKING = 51 *51

= 2601

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