Answer :
Answer:
169
Step-by-step explanation:
x²+26x=23
=> to complete the square, the equation should be : x²+26x + (26/2)² = 23 + (26/2)²
<=> x² +26x + 13² = 23 + 13²
<=> x² +26x +169 = 23 + 169
<=> (x+13)² = 192
so, (x+13)² is the square form , and 169 must be added to complete the square
- x²+26x=23
For 2ab to complete in (a+b)² formula
- 2ab=26
a=1
- 2b=26
- b=13
- b²=169
So 169 must be added