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26 August, 18:29

Which shows 422 - 382 being evaluated using the difference of perfect squares method?

422 - 382 = (1,764 - 1,444) (1,764 + 1,444) = 1,026,560

422 - 382 = 84 - 76 = 8

422 - 382 = (42 - 38) 2 = (4) 2 = 16

422 - 382 = (42 + 38) (42 - 38) = (80) (4) = 320

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  1. 26 August, 22:02
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    Option D

    422 - 382 = (42 + 38) (42 - 38) = (80) (4) = 320

    Step-by-step explanation:

    Let us consider the following:-

    (a + b) (a - b)

    a^2 - ab + ab - b^2

    Since - ab+ab = 0

    Then what will be left is:

    a^2 - b^2

    This is a proof that:

    (a + b) (a - b) is the same as a^2 - b^2

    Let's use actual figures to show this:-

    (5 + 3) (5 - 3)

    25 - 15 + 15 - 9

    - 15+15 is the same as + 15 - 15 = 0

    We will then be left with:

    25 - 9 = 16

    The fact is that we can achieve this same result from the product of their sum and difference.

    Since 5 + 3 = 8 and 5 - 3 = 2

    Then: (8) (2) = 16

    Now, back to the question:

    42^2 - 38^2 can be evaluated using the difference of perfect square method which is simply finding their sum and their difference and then multiplying the two results:

    422 - 382 = (42 + 38) (42 - 38)

    42 + 38 = 80

    42 - 38 = 4

    (80) (4) = 320
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