Yes you can use the discriminant of a quadratic/polynomial. For instance, if

there is one real root. If

there are two real roots and i

there are no real roots
The discriminant comes from the quadratic equation, which is the following.
20 because for all regular polygons their exterior angles add up to 360, so 360\18 =20
Answer:
48.75$
Step-by-step explanation:
the difference is about 16.25$
Answer:
4x² + 4x + 1
Step-by-step explanation:
We know that (a + b)² = a² + 2ab + b², therefore, (2x + 1)² = 4x² + 4x + 1.
Answer:
B
Step-by-step explanation:
Hope this helps! have a great day!