Given the function f ( x ) = { 9 x − 10 x < 0 9 x − 20 x ≥ 0 Calculate the following values: f ( − 1 ) =

Answer 1

This is a piecewise function, which means the function is split up into "pieces" across its domain. For values of x less than 0, we should use 9x-10 as the function, and for values of x >= 0, we should use 9x-20. Since this question is asking about x=-1, we should use the first piece. So we can plug in -1 for 9x-10 to get our answer:

9 * (-1) - 10 = -19

So f(-1) is -19.