ven graph of f(x)=2x^3-5x^2-7x+6. Find all the roots of f(x) by using section method with |b-al=1* ) -1.427 and 0.639 O 3.288, 0.639 and -1.427 O 3.321, 0.639 and -1.427 ) 3.321 and -1.427

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