Question

Solve x² + 9x + 9 = 0 What is the answer and how did you work it out?

Answer 1

Answer:

A) $x=\frac{-9\pm3\sqrt{5}}{2}$

Step-by-step explanation:

$ax^2+bx+c=0$

$x^2+9x+9=0$

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

$x=\frac{-9\pm\sqrt{9^2-4(1)(9)}}{2(1)}$

$x=\frac{-9\pm\sqrt{81-36}}{2}$

$x=\frac{-9\pm\sqrt{45}}{2}$

$x=\frac{-9\pm3\sqrt{5}}{2}$