Question

by applying suitable identity, evaluate: 55²-45²
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Answer 1

Answer:

55²-45²

(55+45)(55-45)

(100)(10)

1000

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Answer 2

55²-45²

By applying identity a²-b²=(a+b)(a-b)

(55+45)(55-45)

(55+45)(55-45)=(100)(10)

=1000