#### Question 1

 a b c The factorised form of $$3z$$ + 6 is $$3(z+6)$$ $$3(z+2)$$ $$3(z+3)$$ The factorised form of $$4x$$ − 12 is $$4(x-3)$$ $$4(x+3)$$ $$2(2x+6)$$ The factorised form of $$3xz$$ + $$6xy$$ − $$12x^2$$ is $$3(xz+2xy-4x^2)$$ $$3x(z+2y)-12x^2$$ $$3x(z+2y-4x)$$