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Using the formula for squaring a binomial, evaluate the (78)^2.

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Using the formula for squaring a binomial, evaluate the (78)2.

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Given (78)2

But we can write 78 as 80-2

And also we know that (a – b)2 = a2-2ab+b2

By applying the above identity we get

(78)2 = (80-2)2= 802-2(80) (2) +22

(80-2)2=6400-320+4=6084

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