$x^2+2x+9=0 \\ \\
a=1 \\ b=2 \\ c=9 \\ b^2-4ac=2^2-4 \times 1 \times 9=4-36=-32 \\ \\
x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}=\frac{-2 \pm \sqrt{-32}}{2 \times 1}=\frac{-2 \pm \sqrt{-16 \times 2}}{2}=\frac{-2 \pm 4i\sqrt{2}}{2}=-1 \pm 2i\sqrt{2}$

The answer is D.

8 0

2 years ago

Read 2 more answers

3/4 = x/20 i need the answer i beg

Nady [450]

Answer:

15/20

Step-by-step explanation:

4 x 5 = 20

3 x 5 = 15

so (sorry for the repetition)

= 15/20

8 0

2 years ago

Write five names for -73

Deffense [45]

Negative 73
drop of 73
minus 73
below 73
taking away 73

6 0

2 years ago