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Posted by **Kiley** on Monday, November 3, 2008 at 6:17pm.

x^2-x+2=0

is 1+9i/2 the correct answer?

- Algebra 2 -
**DanH**, Monday, November 3, 2008 at 6:45pmNo, that is not the answer I get when I plug in to the quadratic formula.

I get

(1 + sqrt7i)/2

and

(1 - sqrt7i)/2

Do you understand how I got this?

- Algebra 2 -
**Kiley**, Monday, November 3, 2008 at 6:52pmWhere does the seven come from?

- Algebra 2 -
- Algebra 2 -
**DanH**, Monday, November 3, 2008 at 7:01pmsqrt(b^2 - 4ac).

b is -1 and a is 1 and c is 2.

So, sqrt(b^2 - 4ac) is

sqrt(-7), or (sqrt7)i.

- Algebra 2 -
**Kiley**, Monday, November 3, 2008 at 7:09pmohhhh! okay thank you!

- Algebra 2 -
**DanH**, Monday, November 3, 2008 at 7:13pmYou're welcome

- Algebra 2 -

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