Question

Fie ecuatia (a+3) * x^2 +(a-2) * x-8=0
Determinati tipul ecuatiei de gradul II pentru:
a) a=2; b) a=4; c) a=-2.
Dau coroana

Answer 1

a)5x^2-8=0
d=4*5*8
d=160
x1,2=+-rad(160)/(2*5)

b)7x^2+2x-8=0
d=4+4*8*7
d=228
x1,2=(-2+-rad(228))/14

c)x^2-4x-8=0
d=16+24
d=42
x1,2=(4+-rad(42))/2