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penyelesaian :
= 3m(3m) + 3m(- 2n) + 2n(3m) + 2n(- 2n)
= 9m² - 6mn + 6mn - 4n²
= 9m² - 4n²
=3m(3m-2n)+2n(3m-2n)
=9m2-6mn+6mn-4n2
=-6mn+6mn+9m2-4n2
=9m2-4n2