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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