<u><em>The answer:</em></u> 6x^3+18x
<u><em>The Explanation:</em></u> You need to uses distributive property to 6x to x^2+3 which will be 6x^3+18x
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if the equation is f(x)=ax^2+bx+c
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When simplified its 8x^9 y^12
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what do u see!????????