Solve the Problem $r _ { 1 }$ Through $r _ { 4 }$

question 93

Essay

Solve the problem.
-Find the approximate values of $r _ { 1 }$ through $r _ { 4 }$ in the factorization
$$6 x ^ { 4 } - 12 x ^ { 3 } - 7 x ^ { 2 } + 13 x - 1 = 6 \left( x - r _ { 1 } \right) \left( x - r _ { 2 } \right) \left( x - r _ { 3 } \right) \left( x - r _ { 4 } \right)$$

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