Answer:
v = -7.46 or v = -0.54
Step-by-step explanation:
[tex]12=(v+4)^2\quad|\sqrt{(\ldots)}\\\\-\sqrt{12}=v+4\qquad\text{or}\qquad\sqrt{12}=v+4\\\\v=-\sqrt{12}-4\qquad\text{or}\qquad v=\sqrt{12}-4\\\\v\approx-3.46-4\qquad\text{or}\qquad v=3.46-4\\\\\boxed{v=-7.46\qquad\text{or}\qquad v=-0.54}[/tex]
