Question

Determine whether x = − 1 is a root of the equation `x^2 − 3x + 2 = 0 `or not.

Answer 1

`x^2 − 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.