Question

find the square of 89 using formula (a+b)^2​

Answer 1

Answer:

we can write 89 as (80+9)

therefore we know (a+b)^2 = a^2 +2ab +b^2

(80 +9 )^2 = (80)^2 + 2(80)(9) +(9)^2

= 6400 + 1440 + 81

=7921

Step-by-step explanation:

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