please help me out and explain it to me

I do not understand because I solved it and got x=-3+square 6 i
Step-by-step explanation:
there is various places u can find how to solve it. Ill send you a link.
Please mark the brainliest!!!!
Answer:
A
Step-by-step explanation:
x^2-6x+25=0
A quadratic equation can be solved by using the quadratic formula, [tex]x = (-b (+/-) \sqrt{b^{2}-4ac }) /2a[/tex]
So the equation to start with is ax^2+bx+c=0, thus your equation has the same layout.
a= 1
b= -6
c= 25
Then plug it in
[tex]x=( -(-6) (+/-) \sqrt{6^{2}-4(1)(25) } )/2(1)\\x= (6(+/-) \sqrt{36-100} )/2\\x= (6(+/-)\sqrt{-64} )/2[/tex]
When you have a negative in the root you have to take out an i
i = -[tex]i^{2}[/tex]
So when you take it out the negative isn't there anymore so you can simplify normally
Now split up the plus and minus
[tex]x= (6 + 8i)/2\\x= 3+4i\\x= (6-8i)/2\\x= 3-4i\\x= (3-4i) and (3+4i)[/tex]
So the answer is A