1. :
f (x)= 3+2 2-5 -6, : 1; 2; 3; 6. x =1 - , f (1)=1+2-5-6=-8¹0 x =-1- , f (-1)=-1+2+5-6=0 3+2 2-5 -6 | x +1 x 3+ x 2 x 2+ x -6 x 2-5 -6 x 2+ x -6 x -6 -6 x -6 f (x)= 3+2 2-5 -6=(x +1)(x 2+ x -6)= =(x +1)(x -2)(x +3) x 2+ x -6=0 D =25 f (x)=(x +1)(x -2)(x +3) | f (x)= 3+3 2-4 -12, : 3+3 2-4 -12 | x f (x)= 3+3 2-4 -12= f (x)=(x -2)(x +2)(x +3) |
f (x)= 3+2 2+5 +4, : 1; 2. x =-1- , f (-1)=-1+2-5+4=0 f (x)= | f (x)= 3-3 2+5 -6, |
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I | |
II | |
III | , D = p 2-4 q <0 |
IV | , D = p 2-4 q <0 |
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1: , Q (x) :
Q (x)= (x - a) r (x - b) s (x 2+ px + q) t (x 2+ ux + v) l,
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2: , :
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W (x) , R (x) , Q (x).
2. :
1) () (). : x 2-4 x +3=(x -)(x -) : |
2) () (). : x 2-4 x +3=(x -1)(x -3) : |
3) () (). , . x 2-4 x +3=(x -1)(x -3) |
4) () (). , . : |
5) () (). , . : x 3-1= : |
5) () (). :(x 3-1)2= : |
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