For this case we have that by definition, the quadratic formula is:
A quadratic equation is of the form:

Option A: This equation can be solved without the quadratic formula

Option B:
This equation is not as easy to solve by factoring or as option A. We can use the quadratic formula.
Option C:

Similarly, this equation can be solved with the quadratic formula
Option D:

In this factored equation we can see that the roots are

Answer:
Option B, C
Answer:
1:34
Step-by-step explanation:
Because it is a one to however many there are in total ratio so thus 1:34
Answer:
A. 15, 20, and 25
Step-by-step explanation:
Note that 3-4-5 is a pythagorean triple via following:

Dividing 15, 20, and 25 by 5 nets you the pythagorean triple 3-4-5.