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21-10-2016
Mathematics

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The product of a + 3 and –2a2 + 15a + 6 is –2a3 + xa2 + 51a + 18. Find the value of x? a. 3 b. 9 c. 12 d. 15

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nobillionaireNobley nobillionaireNobley

26-10-2016

(a + 3)(-2a^2 + 15a + 6) = -2a^3 + 15a^2 + 6a - 6a^2 + 45a + 18 = -2a^3 + 9a^2 + 51a + 18
Therefore, the value of x is 9.

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