1) Factorise : (y - x)a + (x - y)b
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(y - x)a + (x - y)b
= ay - ax + bx - by
= - ax + bx + ay - by
= x(b - a) -y(b - a)
= (x - y)(b - a) ——> Answer
= ay - ax + bx - by
= - ax + bx + ay - by
= x(b - a) -y(b - a)
= (x - y)(b - a) ——> Answer
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