Question

The answers to this question

Answer 1

See explanation

Explanation:

The discriminant is
`{b^(2)-4ac }`

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