In the same way that you would factorise any other expressions that do not contain an equality sign depending on the expressions of which none have been given.
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For example: 9x2-25 = (3x-5)(3x+5) but this only applies to negative expressions it wouldn't apply to 9x2+25
m(g-a)
5(3-2x)
2a(2b-c) :P
What about it? Factorise it?