Posted by **Sarah** on Thursday, November 12, 2009 at 10:15pm.

Complete the square to Solve Quadratic Equation:

Solve the equation. Express the answer in simplest radical form.

-x^2-7x=-11

Please Help!!!! Thanks.

- trigonometry -
**Reiny**, Thursday, November 12, 2009 at 10:20pm
-x^2-7x=-11

x^2 - 7x = 11

x^2 - 7x + **49/4** = 11 + **49/4**

(x - 7/2)^2 = 44/4 + 49/4

x - 7/2 = ± √93/2

x = (7 ±√93)/2

- trigonometry -
**Sarah**, Thursday, November 12, 2009 at 10:24pm
Thank you so much, but I was wondering:

-x^2-7x=-11

x^2 - 7x = 11

You have to divide by -1, wouldn't it be positive 7x.

- trigonometry -
**Reiny**, Thursday, November 12, 2009 at 10:25pm
YOU ARE RIGHT!

good for you for catching that.

I am sure you can make the necessary changes.

(there is one small change)

- trigonometry -
**drwls**, Thursday, November 12, 2009 at 10:27pm
This is not a trigonometry question.

x^2 + 7x + (7/2)^2 = 11 + (7/2)^2

(x + 7/2)^2 = 23 1/4

x = -7/2 +/- sqrt(93)/2

- trigonometry -
**Sarah**, Thursday, November 12, 2009 at 10:30pm
Thank you so much!!!!

Could you please help me with another type of trig math question. I greatly appreciate your help.

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