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Find 'a' if the two polynomials ax^3 + 3x^2 - 9 and 2x^3 + 4x + a, leaves the same remainder

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Find 'a' if the two polynomials ax3 + 3x2 - 9 and 2x3 + 4x + a, leaves the same remainder when divided by x + 3.

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Best answer

Let f(x) = ax3 + 3x2 - 9 and g(x) = 2x3 + 4x + a,

Since. the given polynomials leave the same remainder when divided by x + 3, 

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