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mitchelsewbaran
Determine the intervals on which the function is increasing, decreasing, and constant. Increasing on x < 0; Decreasing on x > 0 Increasing on x > 0; Decreasing on x < 0 Increasing on all real numbers Decreasing on all real numbers
Look at two different x values, let's call them x and x'. We suppose that x' > x. What is the implication for f(x') and f(x)?
e.g. let x' be 10 and x be -10. What follows for f(10) and f(-10)?