Chapter 4 Quadratic Functions and Factoring - 4.3 Solve x(squared) + bx + c = 0 - 4.3 Exercises - Skill Practice - Page 256: 22

$$(s-13)^2$$

Since the coefficient of the squared term is one, we know that the expression must factor to: $$ (s\pm a)(s\pm b)$$ Here, we see that a and b must multiply to get $169$ and add to get $-26$. Thus, we find that the solution is: $$(s-13)^2$$