Answer:

1. (-12)^2-4(4)(9) =0 , the roots are real and equal

2. (-7)^2-4(2)(3) =25 , the roots are real and unequal

3. (15)^2-4(5)(-6) =345 , the roots are real and unequal

4. (-8)^2-4(3)(-9) =172 , the roots are real and unequal

5. (5)^2-4(1)(12) =-23 , the roots are not equal

I hope makatulong po. Ayan lang po alam ko ih kayo na po bahala.