Question

Solve x² + 9x + 9 = 0

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

Answer 1

A)
`x=(-9\pm3√(5))/(2)`

Explanation:

`ax^2+bx+c=0`

`x^2+9x+9=0`

`x=(-b\pm√(b^2-4ac))/(2a)`

`x=(-9\pm√(9^2-4(1)(9)))/(2(1))`

`x=(-9\pm√(81-36))/(2)`

`x=(-9\pm√(45))/(2)`

`x=(-9\pm3√(5))/(2)`