Question

Solve the quadratic function x2 + 4x + 8 = 0 for x.
Answer

x = 2 ± 2i

x = 2 and x = 4

x = -2 ± 2i

x = 2 or x = -2

Answer 1

@abcabc

Answer 2

is that an x "squared" (exponent)?

Answer 3

Yup!

Answer 4

If you're in a rush, I'd eliminate the second and fourth choice because substituting their values in leads to a false statement.

Then use the quadratic formula to see whether the first or third choice is right.

Hope that helps!

Answer 5

First one i think @abcabc check

Answer 6

Another quick hint without having to do all the math. :-)
You know the quadratic formula has -b as the first term and a 2a in the denominator.
Well, I can look at the b term here, and see that it's 4.
So it's negative would be -4.
Then the 2a term will still be positive, so I know the -b term in the answer will be negative (-4 divided by a positive will give me a positive), so I think the right answer is the third choice because it has that '-2' term in it.

Hope that helps!