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Simplify (x-7)( x+7)

  • Algebra -

    You can multiply these binomials like any other.

    x times x and x times 7

    then -7 times x and - 7 times 7

    x^2 + 7x - 7x -49

    x^2 -49

    Or you can recognize this pair as a sum and difference which always multiplies to be the difference of two squares.
    (a+b)(a-b) = a^2 -b^2

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