Which two equations would be most appropriately solved by using the quadratic formula?
Select each correct answer.
3x^2 = 9
0.25x^2 + 0.8x - 8 = 0
-2x^2 + 5x = 7
-(x - 3) (x+9) = 0

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

Option B, C

answer: 590

step-by-step explanation: