- .
( )
f(x)=0 [a,b], f'(x) f''(x) . , , , .1 )-).
' , .
1. f(a)f"(x)<0, .1 ) 1 ). , b (. .2). M0, M1, M2,.... 0 b0,b1,b2, . f(x) Mn (bn,f(bn)) :
(8)
y=0, x=bn+1
(9)
, (a,f(a)), 0 [a,b], .
2. f(a)f"(x)>0 (. .1 1) a,
(10)
, f(x) [a,b]. , - , xn - ,
(11)
(12)
, (12)
(12*)
. x3 -12x-8 = 0.
. , , ; [-1,0]. , ; [-0,7;-0,65], f(-0,7) = 0,057, f(-0,65)= -0,474625.
.. f"(x) = 6x, x f"(x)<0, f(a)f"(x)<0, b0=-0,65, (9).
.
, , .. , (12*). =-0,6945930,000001.
. 2.2 ǹ1.