= 0 f () = 0, = 0 , < 0, , , > 0. = 0, .
. .
. :
, = 1 max (1) = 1/.
f () [, ], , . , [, ]. , , :
;
[, ];
, . 2, , - [, ].
.
, (, ) , , .
, (, ) , , .
, , , , .
= f () (, ), () < 0, , () > 0.
, , () < 0, , , - () > 0.
, , .
, , () = 0 () = , , () , . .
= 0 , () .
() , . , () , . () , . .
.
= 52 + 20 + 9.
. );
. " > 0 , ). .
.
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. - ).
": .
. " = 0, .. : . " < 0, " > 0, - , " < 0, , " < 0, . (4,-125).
.
d = f (), , , .
: 1) , 2) 3) .
1. = f () =b , f () , b, . .
2. = f () = , . , f () . 1, 2, ,
= 1, =2
3. = kx + b = f () k b
( ). = f () , . .
.
. .
2 + 3 = 0 => = - 3/2, , , , . , : = kx + b
k b , ,