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Verified answer
10. (-2y-3)²= (-2y-3)(-2y-3)
= 4y² + 6y + 6y + 9
= 4y² + 12y + 9
11. koefisien nya 5 (b)
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= 4y^2+6y+6y+9
= 4y^2+12y+9
koefisien= 5