Solve the quadratic equation by completing the square. x2+9x-2=0 Here is how far I got: x2+9x-2=0 (adding 2 to both sides) x2+9x=2 (half of 9 is 9/2, and (9/2)2 is 81/4) x2+9x+81/4=2+81/4 (adding 81/4 to both sides) This is where I got stuck: That after adding 81/4 to both sides of the equation, it is x2+9x+81/4=89/4 Can someone tell me please how they got to 89/4?

Algebra and Trigonometry (6th Edition)
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ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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Solve the quadratic equation by completing the square.

x2+9x-2=0

Here is how far I got:

x2+9x-2=0 (adding 2 to both sides)

x2+9x=2 (half of 9 is 9/2, and (9/2)2 is 81/4)

x2+9x+81/4=2+81/4 (adding 81/4 to both sides)

This is where I got stuck: That after adding 81/4 to both sides of the equation, it is x2+9x+81/4=89/4

Can someone tell me please how they got to 89/4?

 

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Hi, I am not asking for a solution. I asked how did you get to 89/4. This is the second time I am asking another person this question, but all they give me is the answers. Thats fine, but I need to know how they got to the part I am stuck at.

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