Question

вычислите f'(x)=0
f(x)=9x^2+72x

Answer 1

f(x) = 9x^2 + 72x 
f`(x) = 18x + 72 
f`(x) = 0 
18x + 72 = 0
18x = - 72 
x = - 4

Answer 2

$f(x) (proizvodnaya)= 2 times 9 times x + 72 = 18x + 72 \ 18x + 72 = 0 \ 18x = - 72 \ x = - 4$