$(x-7)^{2}=$

Step 1 ：Expand the given expression: $(x-7)^{2} = (x-7)(x-7)$

Step 2 ：Multiply the terms: $(x-7)(x-7) = x^2 - 7x - 7x + 49$

Step 3 ：Simplify the expression: $x^2 - 7x - 7x + 49 = x^2 - 14x + 49$

Step 4 ：\(\boxed{x^2 - 14x + 49}\)