A)
f ' (x) = 1/3*3x^2 + 2x + 2 = x^2 + 2x + 2
b)
f ' (x) = (2/x^3 - x) ' = 2*(1/x^3) ' - (x)' = 2*(x^(-3))' - 1 =
= - 3*2*x^(-4) - 1 = - 6x^(-4) - 1
1) -5*x^2-30*x=4*x-12-10
-5*x^2-30*x-4*x+12+10=0
5*x^2+34*x-22=0
2) 3*x^2+9*x-9*x-27=x^2+9*x-8*x-72
3*x^2-x^2-9*x+8*x-27+72=0
2*x^2-x+45=0
1)(a-3)в квадрате=a^2-6a+9
2)(2x+y)=4x^2+4xy+y^2
3)(5б-4х)(5б+4х)=25б^2-16x^2