Question

Cum pot calcula X patrat +2x- 35=0 ??

Answer 1

x²+2x-35=0.

Poti calcula x prin relatiile Viette:

x1+x2=-2
x1*x2=-35

De unde: x1=-7, x2=5

S={-7;5}

Answer 2

x^2 + 2x - 35 = 0
d = b^2 - 4ac =  4 -4x(-35) = 4 + 140 = 144 
x12 = (-b + - $\sqrt{d}$ )/ 2a 
x1 = (-2 + 12 ) / 2 = 10/2 = 5 
x2 = (-2 - 12) / 2 = -14/2 = - 7 

x = { -7; 2}