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to complete the square you add > (10/2)² = 25

then divide 25 by the coefficient of the first term

which is 25/2

the final expression is > (√2 x - 5/√2)² - 25/2 + 1

= (√2 x- 5/√2)² -23/2

to complete the square take the sqrt of 2x² & 25/2

also since you have added 25/2 to the expression

you must - 25/2 to balance up