Answer:
We add 25 and subtract 25 to complete the square.
[tex](x+5)^{2}-38=0\\[/tex] is the equation we get.
Step-by-step explanation:
[tex]x^{2} +10x-13=0\\x^{2} +10x+25-13-25=0\\(x+5)^{2}-38=0\\[/tex]
So, we're adding 25-25 to complete the square.
