The product of a +3 and -2a^2+15a+6 is -2a^3+xa^2+51a+18. What is the value of x?

The options are 3, 9, 12 and 15 for x
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1 Answer

x=9.

(a+3)(-2a^2+15a+6)=

-2a^3+15a^2 +6a

           -6a^2+45a+18

-2a^3+9a^2 +51a+18, so x=9

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