If $f(x) = |x| + 3x^3$ for all real $x$, I want to calculate the value of $f′(−1)$. My answer is $8$, but the solution says it's $-7$. Any ideas?
2026-03-29 10:28:49.1774780129
Differentiation of a function with absolute value
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Did you get the exponent right? The given solution would be correct for $$f(x)= |x|+3x^2.$$