Question A.3: The equation x² + 5x + 4 = 0 has the following roots corresp...

The equation x² + 5x + 4 = 0 has the following roots corresponding to the two signs of the square-root term:

x=\frac{-5 \pm \sqrt{5^{2}-(4)(1)(4)}}{2(1)}=\frac{-5 \pm \sqrt{9}}{2}=\frac{-5 \pm 3}{2}