The number must be added (13/2)².
An equation is a mathematical statement that is made up of two expressions connected by an equal sign.
Given:
x²-13x+4=17
x²-13x+4-17=0
x²-13x-13=0
Using completing the square method
x²-13x-13+(13/2)² - (13/2)²=0
x²-13x +(13/2)²-13 -(13/2)²=0
(x-13/2)² -13-169/4=0
(x-13/2)² -13-169/4=0
(x-13/2)² -221/4=0
(x-13/2)²=221/4.
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