Question 961469
{{{f(x)=(5x+4)^4}}}
{{{df/dx=4(5x+4)^3(5)=20(5x+4)^3}}}
{{{(d2f)/(dx2)=20*3(5x+4)^2*5=300(5x+4)^2}}}
When {{{x=3}}}
{{{(d2f)/(dx2)=300(5(3)+4)^2}}}
{{{(d2f)/(dx2)=300(15+4)^2}}}
{{{(d2f)/(dx2)=300(19)^2}}}
{{{(d2f)/(dx2)=300(361)}}}
{{{(d2f)/(dx2)=108300}}}