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Mathematics, 16.10.2019 23:00 emmawytko

The product of a + 3 and –2a2 + 15a + 6 is –2a3 + xa2 + 51a + 18. what is the value of x?

a=3
b=9
c=12
d=15

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The product of a + 3 and –2a2 + 15a + 6 is –2a3 + xa2 + 51a + 18. what is the value of x?
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