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

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