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20a²+2ab-6b²
2. (9m-4n) (2m+6n)= 18m²+54mn-8mn-24n²
18m²+46mn-24n²
2. (9m x 2m) + (9m x 6n) + (-4n x 2m) + (-4n x 6n) = 18m(kwadrat) + 54mn - 8mn -24n(kwadrat) = 18m(kwadrat) + 46mn - 24n(kwadrat)