Question

factorise÷
1. m(m+b)-7m-7b
2. xy²-yz²-xy+z²​

Answer 1

Answer is in the above attachement

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Answer 2

Answer:

1) m(m+b)-7m-7b

=m(m+b)-7(m+b)

=(m+b)(m-7)

2)xy^2-yz^2-xy+z^2

=xy^2-xy-yz^2+z^2

=xy(y-1)-z^2(y-1)

=(y-1)(xy-z^2)