<span>Решить f'(x) - g'(-2)=0,
если f(x)=(x-1)(x²+x+1) и g(x)=2x/(x+3)
Решение.
f'(x) = </span>(x-1)'(x²+x+1) + (x-1)(x²+x+1)' = 1*(x²+x+1) + (x -1)*(2x +1)=
=x² +x +1 +2x² -2x +x -1 = 3x²;
g'(x) = (2(x +3) - 2x*1)/(x +3)² = (2x +6 -2x)/(x +3)² = 6/(х+3)²
g(-2) = 6/(-2+3)² = 6
теперь само уравнение:
3х² - 6 = 0
3х² = 6
х² = 2
х = +-√2
-2(3a+5c)+8(c-a)-(-6a-7c)=-6a-10c+8c-8a+6a+7a=5c-8a