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Find the value of a such that (x – 4) is a factor of 5x^3 − 7x^2 − ax − 28.

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Find the value of a such that (x – 4) is a factor of 5x3 − 7x2 − ax − 28.

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Let f(x) = 5x3 − 7x2 − ax − 28 be the given polynomial from factor theorem, if (x-4) is a factor of f(x) then f (4) = 0

 

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