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Mathematics, 23.12.2020 17:30 dhhdndnd

15 POINTS EACH WILL GIVE THANKS IF ITS CORRECT PLEASE ANSWER FAST SINCE THIS WAS DUE LAST FRIDAY!
Select all of the following that are quadratic equations.

1. x2 + 3 x -5 = 0
2. x2 - x = 3 x + 7
3. 5 x - 7 = 0
4. 7 x2 + 14 x = 0
5. x3 - 3 x2 + 1 = 0
6. x - 5 = 9 x + 7

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