Algebra

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I do not understand multioplying binomials + factoring
(x+9) (x-9)
can you show and explain the steps

  • Algebra -

    +9 * -9 = -81

    x * -9 = -9x

    x * 9 = 9x

    x *x = x^2

    9x-9x = 0

    Answer: x^2 - 81

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