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f(x)=(x - 5)(2x + 7) (7x - 3) has zeros at x = -3.5, x =3/7 , and x = 5.What is the sign of

f(x)=(x - 5)(2x + 7) (7x - 3) has zeros at x = -3.5, x =3/7 , and x = 5.What is the sign of f on the interval 3/7

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