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 =

Question

Sharon Douglas

Mathematics

10 December, 05:49

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 =

+5

Answers (1)

Know the Answer?

Ray · Answer 1

The Edgenuity site states that the three correct answers to this problem are

(B) x+2=plus or minus√27/5,

(C) 5 (x^2+4x) = 7, and

(D) 5 (x^2+4x+4) = 7+20

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 + 202) x + 2 =3) 5 (x2 + 4x) = 74) 5 (x2 + 4x + 4) = 7 + 205) 5 (x2 + 4x) = - 76) x + 2 =

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 =