You could use the FOIL algorithm, first inner outer last
15 m^2 + 20 m -18 m - 24 = 15 m^2 +2 m -24
Or you could multiply term by term and add
= 15 m^2 + 20 m - 18 m - 24 = 15 m^2 + 2 m = 24
which we already knew
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