5(m-2) - m(m-2)
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-m2+3m-2 -m2+2m+m-2 -m(m -2)+1(m-2) (-m+1)(m-2) or
factor by grouping 7m(m-2)+6n(2-m)
m-2
2m^2 - 8 = 2(m^2 - 4) = 2(m-2)(m+2). A difference of squares, x^2 - y^2 say (or m^2 - 2^2 above), factorises as (x - y)(x + y).
If: m/8 -2 = 48 Then: m = 400