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March 28, 2017

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what (5 -radical 2)(5+radical 2)

  • math - ,

    Use the fact that (a + b)(a - b)
    = a^2 - b^2,
    The answer is 25 - 2 = 23

  • math - ,

    (5 -√2)(5+√2)
    = 25 - 2
    = 23


    this resembles the difference of square pattern
    (a+b)(a-b) = a^2 - b^2

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