Given f (x) = x^2-x; find f (-5)

Plug in - 5 where X is.

f ( - 5) = ( - 5) ^2 - ( - 5).

( - 5) ( - 5) = 25 so now we have 25 - ( - 5). Because there are two negatives back to back, the number becomes a positive so the equation becomes 25 + 5 = 30.

f ( - 5) = 30.