Using property of perfect squares, find the value of the following:
(b) (78)² – (77)²​

2 thoughts on “Using property of perfect squares, find the value of the following:<br />(b) (78)² – (77)²​”

1. Answer:

   78+77*78-77=155

   A+B*A-B=A^2-B^2

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2. using

   (a+b)(a-b) identity

   (78+77)(78-77)

   155(1)

   155

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