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Which are steps that could be used to solve 0 = 9(x2 + 6x) – 18 by completing the square? Check all that apply.

18 +81 = 9(x2 + 6x +9)

18+9 = 9(x2 + 6x +9)

18+ 36 = 9(x2 + 6x + 36)

11 = (x + 3)2

1342 = (x + 6)2

799 = (x + 3)2

Respuesta :

calculista

Answer:

[tex]18+81=9(x^{2}+6x+9)[/tex]

[tex]11=(x+3)^{2}[/tex]

Step-by-step explanation:

we have

[tex]0=9(x^{2} +6x)-18[/tex]

Adds 18 both sides

[tex]18=9(x^{2} +6x)[/tex]

Complete the square

[tex]18+81=9(x^{2}+6x+9)[/tex]

[tex]99=9(x^{2}+6x+9)[/tex]

Divide by 9 both sides

[tex]11=(x^{2}+6x+9)[/tex]

Rewrite as perfect squares

[tex]11=(x+3)^{2}[/tex]

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