15. Factorise:a2 + b2 - 2 (ab - ac + bc) from Mathematics Pol
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    Polynomials

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    155.

    15. Factorise:
    a2 + b2 - 2 (ab - ac + bc)

     a2 + b2 - 2(ab - ac + bc)
    = a2 + b2 - 2ab + 2ac - 2bc
    = (a - b)2 + 2c(a - b)
    = (a - b) (a - b + 2c).

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