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For finding roots. We equate it to 0
As there is Modulus we can split into 2 cases
After we find the roots we need to check the sol.
Now checking all Roots for f(x) = 0
Now, As only the signs of the roots are changed so the modulus of -ve or +ve will just be +ve. Therfore the roots of f(x) = 0 Are 1, 2, -1. -2.
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