a) 2x²-3x+1 =0 , delta = 9 -8 = 1
x1 = (3+1)/4 = 4/4 =1
x2 = (3-1)/4 = 2/4 = 1/2
b) 3x = 12, x = 4
c) ecuatia de la a) presupun
suma 1+ 1/2 amplifici pe 1 cu 2
2/2 + 1/2 = 3/2
produsul 1 * 1/2 = 1/2
d) egal cu 1, asa e formula
2. nu stiu
3. x+y = 10
x*y = 15
x = 10-y
(10-y)*y = 15
x = 10-y
-y²+10y -15 = 0/*(-1)
x=10-y
y²-10y +15 = 0, delta = 100-60 = 40
Vdelta = 2V10
x1 = (-10+2V10)/2 = 2(-5+V10)/2 = -5+V10
x2 = (-10-2V10)/2 = 2(-5-V10)/2 = -5-V10
