Question

помогите 21 и 22 срочно надо

Answer 1

1)y=(1/3)x³-x²-15x+2

 y´=3(1/3)x²-2x-15=x²-2x-15

y´=0

x²-2x-15=0 , (x-5)(x+3)=0

(ab=0 ⇔a=0 ∨ b=0)

a)x-5=0 , x=5

b)x+3=0, x=-3

2)s(t)=4t³+3t²+5

v(t)=s´(t)

 v(t)=12t²+6t

v(2)=12×2² + 6×2=12×4 +12=48 + 12=60

v(2c)=60