Evaluate the function f(x) = x^2 - 10x for the given value of x. Simplify your answer.

F(x+h)=

f(x+h) = (x+h)^2 - 10(x+h)

f(x+h) = x^2 + 2hx + h^2 - 10x - 10h
f(x+h) = x^2 + 2hx + h^2 - 10x - 10h

Therefore, f(x+h) = x^2 + 2hx + h^2 - 10x - 10h.