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Question
Determine whether x = -1 is a root of the equation x2 - 3x +2=0 or not.
Solution
x2 - 3x +2=0
Put x = -1 in L.H.S.
L.H.S. = (-1)2 - 3(-1) +2
= 1 +3 +2=6 ≠ R.H.S.
Then x = -1 is not the solution of the given equation.
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