Question
Find all values of $x($ if any $)$ where the tangent line to the graph of the given equation is horizontal. HINT [The tangent line is horizontal when its slope is zero.]$$y=-3 x^{2}-x$$
Step 1
The function is $y=-3x^{2}-x$. We can use the power rule for differentiation, which states that the derivative of $x^n$ is $nx^{n-1}$. Show more…
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