Найдите производную функций: a) b)

Решите задачу:

$f(x) = \sqrt{7+14x} -5 x^{6}\\\\f'(x)=( \sqrt{7+14x})' -5( x^{6})'= \frac{1}{2 \sqrt{7+14x} }*(7+14x)' - 5*6 x^{5}=$ $\frac{14}{2 \sqrt{7+14x} } -30 x^{5} = \frac{7}{ \sqrt{7+14x} }-30 x^{5}\\\\\ f(x)=(-4 x^{3} +1) ^{4} -(2-x) ^{5}\\\\f'(x)=[(-4 x^{3}+1) ^{4}]' - [(2-x) ^{5} ]'= 4(-4 x^{3}+1) ^{3}*(-4 x^{3}+1)'-$ $5(2-x) ^{4}*(2-x)' =4*(-12 x^{2} )(-4 x^{3}+1) ^{3}+5(2-x) ^{4} =$ $-48 x^{2} (-4 x^{3}+1) ^{3} +5(2-x) ^{4}$