Question

Factorise z-15+15xy-xyz

Answer 1

(i) x2 +xy+8x+8y

=x(x+y)+8(x+y)

=(x+8)(x+y)

(ii) 15xy−6x+5y−2

=3x(5y−2)+1(5y−2)

=(3x+1)(5y−2)

(iii) ax+by−ay−by

=x(a+b)−y(a+b)

=(x−y)(a+b)

(iv) 15pq+15+9q+25p

=3q(5p+3)+5(5p+3)

=(3q+5)(5p+3)

(v) z−7+7xy−xyz

=z(1−xy)−7(1−xy)

=(z−7)(1−xy)

Answer 2

Answer:

loda

Step-by-step explanation:

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