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25 August, 11:15

What are the factors of x^2-25

A. (x-5) (x-5)

B. (x+5) (x-5)

C. (x-1) (x+25)

D. Prime

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Answers (1)
  1. 25 August, 12:03
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    a^2 - b^2 = (a + b) (a - b)

    so

    x^2 - 25

    = x^2 - 5^2

    = (x + 5) (x - 5)

    Answer is B. (x + 5) (x - 5)
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