Question

ma poate ajuta cineva clasa 9

Answer 1

Răspuns:

1. a) S = -b/a = a ;  P= c/a = 9

b) S= 6 ; P= 1

C) S= 0 ; P= -9

D)S= -3/2; P= -5/2

2. a) S= X1+X2= 4; P=X1 x X2= 3; ECUATIA : x^2  - Sx + P = 0=> x^2 -4x+3

 b) S= 1; P= -20 ; ecuatia = x^2 -x -20 = 0

c) S= -7; P= 10; ECUATIA = x^2 +7x +10=0

3) a) x1+x2= -b/a = 3/2

     b) x1 x x2 = c/a = 3

4) a) x1 ^2 + x2 ^2 = S^2 - 2P = 16  - 6 = 10