drumrunnerbld drumrunnerbld
  • 14-09-2021
  • Mathematics
contestada

Solve x² + 9x + 9 = 0

What is the answer and how did you work it out?

Solve x 9x 9 0 What is the answer and how did you work it out class=

Respuesta :

goddessboi goddessboi
  • 14-09-2021

Answer:

A) [tex]x=\frac{-9\pm3\sqrt{5}}{2}[/tex]

Step-by-step explanation:

[tex]ax^2+bx+c=0[/tex]

[tex]x^2+9x+9=0[/tex]

[tex]x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}[/tex]

[tex]x=\frac{-9\pm\sqrt{9^2-4(1)(9)}}{2(1)}[/tex]

[tex]x=\frac{-9\pm\sqrt{81-36}}{2}[/tex]

[tex]x=\frac{-9\pm\sqrt{45}}{2}[/tex]

[tex]x=\frac{-9\pm3\sqrt{5}}{2}[/tex]

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