How do you solve x( x + 2) = - 9?

1 Answer
Jul 22, 2017

All you need to do is to get the quadratic formula:
-b+-sqrt(b^2-4ac)/(2a)
and plug the values in as is.

Explanation:

x(x+2)=-9

Use the order of operations to simplify and combine the equation into one polynomial ax^2+bx+c.

x^2+2x+9=0

Plug the values in the quadratic formula as shown in the polynomial.

-2+-sqrt(2^2-4(1)(9))/(2(1))

Simplify the equation into its solutions.

=(-2+-sqrt4-36)/2
=(-2+-4isqrt2)/2
=-1+-2isqrt2