The function (without the absolute value bars) has a positive slope for x > -4.5 and negative slope for x < -4.5.
Of course, the slope at x = ;4.5 is 0.
The derivative is 2x + 9 for x ≥ -4.5 and -2x - 9 for x < -4.5.
What is the derivative of the function f(x) = |x^2+9x+18|?
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