how do you solve this problem (m-5)^4+36=13(m-5)^2 algebraically

(m-5)^4 + 36 = (m-5)^2

let (m-5)^2 = x, so your equation becomes

x^2 + 36 = x
x^2 - x + 36 = 0
x^2 = (1 ± √(1-144) )/2
= (1 ± √-143)/2

then (m - 5)^2 = (1 ± √-143)/2
m-5 = ±√(1 ± √-143)/2

m = 5 ±√(1 ± √-143)/2
= [ 10 ±√(1 ± √-143) ]/2

or as Wolfram has it:

(1/2) [ 10 ±√(1 ± √-143) ]
or
(1/2) [ 10 ±√(1 ± i√143) ]

http://www.wolframalpha.com/input/?i=solve+%28m-5%29%5E4+%2B+36+%3D+%28m-5%29%5E2