-1/2, 1., 1/2
1/2, 1, 1/2
1/2, 1, -1/2
1/2, -1, 1/2
Correct answer is A
This is a polynomial of the 3rd order, thus x should have three answers. Use the factors given to get values of x as 1, -1 and -2.
Form three equations, and carry out elimination and subsequent substitution to get a = -1/2, b = 1, and c = 1/2
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