Find the zeros of f(x), given that k is a zero.f(x)=7x^3+5x^2 + 12x-4;  k=2/7

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Karla -If k=2/7 is a zero, then (x - 2/7) is a factor of this polynomial.  So, the next step is to use either long division or synthetic division.For example, divide the polynomial using "long" division by "x - 2/7".  You will have a quadratic equation left to solve. Solve the quadratic using the quadratic formula.Hope that helps