Z zt1596 New member Joined May 30, 2016 Messages 1 May 30, 2016 #1 I'm in precalc and have no idea what this problem is asking or how to solve it: Suppose f(x) is a twice differentiable function satisfying f(x^2)=f(x)+x^2. What are f'(1) and f"(1)? Thanks in advance.
I'm in precalc and have no idea what this problem is asking or how to solve it: Suppose f(x) is a twice differentiable function satisfying f(x^2)=f(x)+x^2. What are f'(1) and f"(1)? Thanks in advance.
D Deleted member 4993 Guest May 30, 2016 #2 zt1596 said: I'm in precalc and have no idea what this problem is asking or how to solve it: Suppose f(x) is a twice differentiable function satisfying f(x^2)=f(x)+x^2. What are f'(1) and f"(1)? Thanks in advance. Click to expand... This is not a pre-calc question!! Do you know how to calculate derivative of a function - or differentiate a function?
zt1596 said: I'm in precalc and have no idea what this problem is asking or how to solve it: Suppose f(x) is a twice differentiable function satisfying f(x^2)=f(x)+x^2. What are f'(1) and f"(1)? Thanks in advance. Click to expand... This is not a pre-calc question!! Do you know how to calculate derivative of a function - or differentiate a function?
pka Elite Member Joined Jan 29, 2005 Messages 11,978 May 30, 2016 #3 zt1596 said: I'm in precalc and have no idea what this problem is asking or how to solve it: Suppose f(x) is a twice differentiable function satisfying f(x^2)=f(x)+x^2. What are f'(1) and f"(1)? Click to expand... \(\displaystyle \begin{gathered} f({x^2}) = f(x) + {x^2} \hfill \\ f'({x^2})(2x) = f'(x) + 2x \hfill \\ f''({x^2}){(2x)^2} + 2f'({x^2}) = f''(x) + 2 \hfill \\ \end{gathered} \) You show us the rest.
zt1596 said: I'm in precalc and have no idea what this problem is asking or how to solve it: Suppose f(x) is a twice differentiable function satisfying f(x^2)=f(x)+x^2. What are f'(1) and f"(1)? Click to expand... \(\displaystyle \begin{gathered} f({x^2}) = f(x) + {x^2} \hfill \\ f'({x^2})(2x) = f'(x) + 2x \hfill \\ f''({x^2}){(2x)^2} + 2f'({x^2}) = f''(x) + 2 \hfill \\ \end{gathered} \) You show us the rest.