Secant method with interval end-points as starting points to determine roots of the following equations to three significant decimal figures. \text { a. } 3 x^{3}-2 x^{2}-3 x+12=0 \text { b. } 3 x^{5}-2 x^{4}+4 x^{3}+5 x^{2}-16=0 \text {, }
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