f using the method of completing the square to solve the quadratic equation x^2+17x-22=0, which number would have to be added to "complete the square"?

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter4: Polynomials
Section4.2: Adding And Subtracting Polynomials
Problem 6P
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If using the method of completing the square to solve the quadratic equation x^2+17x-22=0, which number would have to be added to "complete the square"?

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