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(2m-3n) (2m-3n)
pembuktian:4m²-6mn-6mn-9n² (dikalikan kembali) dan disederhanakan
4m²-12mn-9n²
jadi,jawabnya adalah (2m-3n) (2m-3n) atau kuadrat (2m-3n)²
= 2m(2m - 3n) - 3n(2m - 3n)
= (2m - 3n)(2m - 3n)
= (2m - 3n)²