## Intermediate Algebra for College Students (7th Edition)

$(x-5)^2$
RECALL: $a^2-2ab+b^2=(a-b)^2$ The given trinomial can be written as: $=x^2-2(x)(5) + 5^2$ This trinomial is in the same form as the perfect square trinomial above, where $a=x$ and $b=5$. Factor the perfect square trinomial using the formula above to obtain: $=(x-5)^2$