Answer:
See explanation
Step-by-step explanation:
The discriminant is
1. 9² - 4(1)(20) = 81 - 80 = 1 so there are 2 solutions
2. (-9)² - 4(3)(-13) = 81 + 156 = 237, so there are 2 solutions
3. The first answer is correct
4. The third answer is correct
It's already simplified...unless your teacher wants it in decimal form?
The answer is:
212/100
=(200/100)+(12/100)
=2.00+0.12
=2.12