f(x) = 3x+1, x less than or equal to 0
= x^2,0

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)

tkhunny · Answer

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

johnsmith18 · Answer

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

tkhunny · Answer

The three inequalities divide up the x-axis (or the number line or the Real Numbers) into three distinct pieces.

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To find f(3), you must use the definition associated with the piece you want.

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johnsmith18 · Answer

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