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9. (2x+3y)² = (2x+3y)(2x+3y)
= 2x.2x + 2x.3y + 3y.2x + 3y.3y
= 4x²+6xy+6xy+9y²
= 4x²+12xy+9y²
a=4 b=12 c=9
a+b+c = 4+12+9 = 25
semoga bisa di pahami dan bisa membantu
1 . -5a + 5ab + 9b ( a )
2. 25 ( c )
Semoga membantu^^
Maaf ya terlambat ^^