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19 December, 15:35

Simplify p (p - q) - q (q - p).

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Answers (2)
  1. 19 December, 15:40
    0
    ((p^2) - pq) - ((q^2) - pq)

    (p^2) - (q^2) - 2pq
  2. 19 December, 15:50
    0
    P (p-q) - q (q-p)

    a (b+c) = a (b) + a (c) so ...

    p (p) + p (-q) - q (q) - q (-p)

    p² - pq - q² + qp

    a*b = b*a so ...

    -pq + qp = 0 so ...

    The answer is ...

    p² - q²
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