Question

Determine whether x = -1 is a root of the equation x² – 3x +2=0 or not.

Answer 1

`x^2 - 3x + 2 = 0`

Put x = -1 in LHS

LHS = `(-1)^2 -  3(-1) + 2`

= 1 + 3 + 2 = 6 ≠ R.H.S

Then x = -1 is not the solution of the given equation.