Sergey is solving 5x2 + 20x - 7 = 0. Which steps could he use to solve the quadratic equation? Check all that apply.
1) 5 (x2 + 4x + 4) = - 7 + 20
2) x + 2 =
3) 5 (x2 + 4x) = 7
4) 5 (x2 + 4x + 4) = 7 + 20
5) 5 (x2 + 4x) = - 7
6) x + 2 =
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