Factorise the following:
y2 - yz - 5y + 5z
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= y(y - z) - 5(y - z)
= (y - z)(y - 5).
Hence, y2 - yz - 5y + 5z = (y - z)(y - 5)
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x(x2 + y2 - z2) + y(-x2 - y2 + z2) - z(x2 + y2 - z2).
x2 + xy - x - y
5xy + 7y - 5y2 - 7x
5p2 - 8pq - 10p + 16q