Answer:
d = 2[tex]\sqrt{7}[/tex]
Step-by-step explanation:
You want to solve for d by itself, so you must take the square root of both sides.
d = [tex]\sqrt{68}[/tex]
This can be simplified, since this square root has a perfect square inside. You take out the perfect square (which is 4) and end up with 2[tex]\sqrt{7}[/tex]
