## Algebra: A Combined Approach (4th Edition)

The logic here is that x/0 is undefined as it's infinite. If we divide 10 by 5 we get 2, if we divide 10 by 2 we get 5 and if we divide 10 by 0.1 we get 100. The smallest number possible (0) is infinite when divided by a number. Thus, we must make the denominator 0. $x^{2}$ + 4x + 3 = 0 (x+3)(x+1) = 0 Thus, x=-3 or x=-1