problemas cuadraticos

1. 1
2
3
4
5
6
7
8 x2 + (7 − x)2 = 25
9 7x2 + 21x − 28 = 0
10 −x2 + 4x − 7 = 0
11
12 6x2 −5x +1 = 0
13
14

2. 15
16