solve each of the following equations by first factoring the polynomia
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. Solve each of the following equations by first factoring the polynomials, and then applying the zero productproperty.either \text { (a) } 9 x^{2}-42 x+49=0 \text { (b) } 2 x^{3}+3 x^{2}-8 x-12=0 \text { (c) } 2 j^{2}-2=0