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= 15a² +21a -20a -28
= 15a² +a -28
Itu jawabannya.
= ( 3a . 5a ) + ( 3a . 7 ) + ( - 4 . 5a ) + ( - 4 . 7 )
= 15 + 21a - 20a - 28
= 15 + a - 28