Posted by **jeff** on Monday, June 29, 2009 at 11:49pm.

is the function f(x)=x^2 increasing on decreasing at x = -1.

can anyone please check my reasoning:

the value of the derivative of the function at x=-1 is -2, so that means the slope of the tangent line to the graph at that is a negative value so the function is decreasing at x = -1.

- calculus -
**MathMate**, Tuesday, June 30, 2009 at 12:28am
Correct!

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