Question

Verify whether the following are roots of the polynomial equation indicated against them:

$x^2 + 4 x + 3 = 0;$ $x = - 1 , 2$

Answer 1

no its not. The roots are -1,-3.
$x^{2}$+4x+3=0
$x^{2}$+3x+1x+3=0
x(x+3)+1(x+3)=0
x+1=0 or x+3=0
x=-1 or x=-3

Answer 2

The given equation is $x^{2} +4x+3$ =0
so substitute the values of x which are given in the question if they satisfy then they are roots of the equation .