Factorise the following:
5ph - 10qk + 2rph - 4qrk
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= 5(ph - 2qk) + 2r(ph - 2qk)
= (5 + 2r)(ph - 2qk).
Hence, 5ph - 10qk + 2rph - 4qrk = (5 + 2r)(ph - 2qk).
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ab2 + (a - 1)b - 1
2a - 4b - xa + 2bx
x2 - x(a + 2b) + 2ab
ab(x2 + y2) - xy(a2 + b2)