Answer:
[tex] \boxed{\sf {(d - 5)}^{2}} [/tex]
Step-by-step explanation:
Factor the following:
[tex] \sf \implies {d}^{2} - 10d + 25[/tex]
The factors of 25 that sum to -10 are -5 and -5.
So,
[tex] \sf \implies {d}^{2} - 5d - 5d+ 25[/tex]
[tex] \sf \implies d(d - 5) - 5(d - 5)[/tex]
[tex] \sf \implies (d - 5)(d - 5)[/tex]
[tex] \sf \implies {(d - 5)}^{2} [/tex]
