Verified Answer :

apologiabiology

take 1/2 of 10
10/2=5
square it
5^2=25

add to both sides
x^2+10x+25=13+25
factor perfec squaer
(x+5)^2=38
sqrt both sides
x+5=+/-√38
minus 5
x=-5+√38 or -5-√38

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