Question

f(x) = 3x+1, x less than or equal to 0
= x^2,0 < x < 4
= x-5, x greater than or equal to 4

evaluate for f(3)

Answer 1

What sort of help do you need? Are you wondering HOW to substitute? Are you wondering which piece to use to substitute?

Answer 2

I know that 3 should be substituted for the x's, I just don't understand how this can be done in three inequalities.

Answer 3

The three inequalities divide up the x-axis (or the number line or the Real Numbers) into three distinct pieces.



To find f(3), you must use the definition associated with the piece you want.