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The three roots (to 4 decimal places) of y = 0.91x3 - 10.67x2 + 3.675x + 49.89 = 0 are:
-1.8988,2.9891 & 12.6711.
-1.8654, 2.6982 & 10.8924.
There are only two roots which are -1.1454 and 2.4910
There is only one root which is -1.7689
-2.1221, 2.7797 & 9.8804.
-1.6331, 3.5657 & 11.1678.
-1.7689, 2.5178 & 11.5642.
-1.1454, 2.4910 & 9.0988.
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